X-12=.9*X

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Solution for X-12=.9*X equation:


Simplifying
X + -12 = 0.9X

Reorder the terms:
-12 + X = 0.9X

Solving
-12 + 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.
-12 + X + -0.9X = 0.9X + -0.9X

Combine like terms: X + -0.9X = 0.1X
-12 + 0.1X = 0.9X + -0.9X

Combine like terms: 0.9X + -0.9X = 0.0
-12 + 0.1X = 0.0

Add '12' to each side of the equation.
-12 + 12 + 0.1X = 0.0 + 12

Combine like terms: -12 + 12 = 0
0 + 0.1X = 0.0 + 12
0.1X = 0.0 + 12

Combine like terms: 0.0 + 12 = 12
0.1X = 12

Divide each side by '0.1'.
X = 120

Simplifying
X = 120

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