90=.2(100+X)

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Solution for 90=.2(100+X) equation:


Simplifying
90 = 0.2(100 + X)
90 = (100 * 0.2 + X * 0.2)
90 = (20 + 0.2X)

Solving
90 = 20 + 0.2X

Solving for variable 'X'.

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

Add '-0.2X' to each side of the equation.
90 + -0.2X = 20 + 0.2X + -0.2X

Combine like terms: 0.2X + -0.2X = 0.0
90 + -0.2X = 20 + 0.0
90 + -0.2X = 20

Add '-90' to each side of the equation.
90 + -90 + -0.2X = 20 + -90

Combine like terms: 90 + -90 = 0
0 + -0.2X = 20 + -90
-0.2X = 20 + -90

Combine like terms: 20 + -90 = -70
-0.2X = -70

Divide each side by '-0.2'.
X = 350

Simplifying
X = 350

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