Solve for x
x=-\frac{20}{799}\approx -0.025031289
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x-2x\times 400=20
Multiply both sides of the equation by 20, the least common multiple of 20,10.
x-800x=20
Multiply 2 and 400 to get 800.
-799x=20
Combine x and -800x to get -799x.
x=\frac{20}{-799}
Divide both sides by -799.
x=-\frac{20}{799}
Fraction \frac{20}{-799} can be rewritten as -\frac{20}{799} by extracting the negative sign.
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