x-40=.9x

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Solution for x-40=.9x equation:


Simplifying
x + -40 = 0.9x

Reorder the terms:
-40 + x = 0.9x

Solving
-40 + x = 0.9x

Solving for variable 'x'.

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

Add '-0.9x' to each side of the equation.
-40 + x + -0.9x = 0.9x + -0.9x

Combine like terms: x + -0.9x = 0.1x
-40 + 0.1x = 0.9x + -0.9x

Combine like terms: 0.9x + -0.9x = 0.0
-40 + 0.1x = 0.0

Add '40' to each side of the equation.
-40 + 40 + 0.1x = 0.0 + 40

Combine like terms: -40 + 40 = 0
0 + 0.1x = 0.0 + 40
0.1x = 0.0 + 40

Combine like terms: 0.0 + 40 = 40
0.1x = 40

Divide each side by '0.1'.
x = 400

Simplifying
x = 400

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