3x-12-2x=90

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Solution for 3x-12-2x=90 equation: 


Simplifying
3x + -12 + -2x = 90

Reorder the terms:
-12 + 3x + -2x = 90

Combine like terms: 3x + -2x = 1x
-12 + 1x = 90

Solving
-12 + 1x = 90

Solving for variable 'x'.

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

Add '12' to each side of the equation.
-12 + 12 + 1x = 90 + 12

Combine like terms: -12 + 12 = 0
0 + 1x = 90 + 12
1x = 90 + 12

Combine like terms: 90 + 12 = 102
1x = 102

Divide each side by '1'.
x = 102

Simplifying
x = 102

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