2x-12+x-3=21

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Solution for 2x-12+x-3=21 equation:


Simplifying
2x + -12 + x + -3 = 21

Reorder the terms:
-12 + -3 + 2x + x = 21

Combine like terms: -12 + -3 = -15
-15 + 2x + x = 21

Combine like terms: 2x + x = 3x
-15 + 3x = 21

Solving
-15 + 3x = 21

Solving for variable 'x'.

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

Add '15' to each side of the equation.
-15 + 15 + 3x = 21 + 15

Combine like terms: -15 + 15 = 0
0 + 3x = 21 + 15
3x = 21 + 15

Combine like terms: 21 + 15 = 36
3x = 36

Divide each side by '3'.
x = 12

Simplifying
x = 12

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