(90-x)*0.3*0.4=20

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Solution for (90-x)*0.3*0.4=20 equation: 


Simplifying
(90 + -1x) * 0.3 * 0.4 = 20

Reorder the terms for easier multiplication:
0.3 * 0.4(90 + -1x) = 20

Multiply 0.3 * 0.4
0.12(90 + -1x) = 20
(90 * 0.12 + -1x * 0.12) = 20
(10.8 + -0.12x) = 20

Solving
10.8 + -0.12x = 20

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-10.8' to each side of the equation.
10.8 + -10.8 + -0.12x = 20 + -10.8

Combine like terms: 10.8 + -10.8 = 0.0
0.0 + -0.12x = 20 + -10.8
-0.12x = 20 + -10.8

Combine like terms: 20 + -10.8 = 9.2
-0.12x = 9.2

Divide each side by '-0.12'.
x = -76.66666667

Simplifying
x = -76.66666667

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