12x-7=5x-21

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Solution for 12x-7=5x-21 equation:


Simplifying
12x + -7 = 5x + -21

Reorder the terms:
-7 + 12x = 5x + -21

Reorder the terms:
-7 + 12x = -21 + 5x

Solving
-7 + 12x = -21 + 5x

Solving for variable 'x'.

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

Add '-5x' to each side of the equation.
-7 + 12x + -5x = -21 + 5x + -5x

Combine like terms: 12x + -5x = 7x
-7 + 7x = -21 + 5x + -5x

Combine like terms: 5x + -5x = 0
-7 + 7x = -21 + 0
-7 + 7x = -21

Add '7' to each side of the equation.
-7 + 7 + 7x = -21 + 7

Combine like terms: -7 + 7 = 0
0 + 7x = -21 + 7
7x = -21 + 7

Combine like terms: -21 + 7 = -14
7x = -14

Divide each side by '7'.
x = -2

Simplifying
x = -2

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