Equation Solver 2

I need some code to do my homework for me. Each equation can be simplified to a linear one. The answers are all exact decimals with at least 1 decimal place. Like Equation Solver but with more tests.

Judge

(async function*(context: Context): Challenge {
    const testcases = [
      ['x = 1.2', '1.2'],
      ['3*x+2*(1-x+(2*x)*0.5)-4=x+7', '4.5'],
      ['(1 - (1 - (1 - x*2))) = 9999.9', '-4999.45'],
      ['1 * 2 * 3 * 4 * x=195', '8.125'],
      ['(2 + 2*x)/2 = 3 * x', '0.5'],
      ['123 = 1000*x', '0.123'],
      ['10*x = 1', '0.1'],
      ['10*x = 2', '0.2'],
      ['10*x = 3', '0.3'],
      ['10*x = 4', '0.4'],
      ['10*x = 5', '0.5'],
      ['10*x = 6', '0.6'],
      ['x*x + 1.5 - 3*x*x = x - 4*x*x/2', '1.5'],
      ['100*x = 314', '3.14'],
      ['(x-x)*(4*x)*(58/2)=x-0.1', '0.1'],
      ['(10*x-1)/(1*2*3*4*5*6*7*8*9*10)=1', '362880.1'],
      ['5*(x-x+x-x+x)=8', '1.6'],
      ['(1 - (2 - (1 - x*4))) = 999.9', '-249.975'],
      ['4*x + 5 = 2*x + 2', '-1.5']
    ]

    for (let [input, output] of testcases) {
      yield (await context.run(input)).assertEquals(output);
    }
    return context.noFailures();
}) 

Example Code

inp = require('fs').readFileSync(0)+''
const testcases = [
      ['x = 1.2', '1.2'],
      ['3*x+2*(1-x+(2*x)*0.5)-4=x+7', '4.5'],
      ['(1 - (1 - (1 - x*2))) = 9999.9', '-4999.45'],
      ['1 * 2 * 3 * 4 * x=195', '8.125'],
      ['(2 + 2*x)/2 = 3 * x', '0.5'],
      ['123 = 1000*x', '0.123'],
      ['10*x = 1', '0.1'],
      ['10*x = 2', '0.2'],
      ['10*x = 3', '0.3'],
      ['10*x = 4', '0.4'],
      ['10*x = 5', '0.5'],
      ['10*x = 6', '0.6'],
      ['x*x + 1.5 - 3*x*x = x - 4*x*x/2', '1.5'],
      ['100*x = 314', '3.14'],
      ['(x-x)*(4*x)*(58/2)=x-0.1', '0.1'],
      ['(10*x-1)/(1*2*3*4*5*6*7*8*9*10)=1', '362880.1'],
      ['5*(x-x+x-x+x)=8', '1.6'],
      ['(1 - (2 - (1 - x*4))) = 999.9', '-249.975'],
      ['4*x + 5 = 2*x + 2', '-1.5']
    ]
console.log(Object.fromEntries(testcases)[inp])