-5x-12+7x=15-21

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Solution for -5x-12+7x=15-21 equation:


Simplifying
-5x + -12 + 7x = 15 + -21

Reorder the terms:
-12 + -5x + 7x = 15 + -21

Combine like terms: -5x + 7x = 2x
-12 + 2x = 15 + -21

Combine like terms: 15 + -21 = -6
-12 + 2x = -6

Solving
-12 + 2x = -6

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 + 2x = -6 + 12

Combine like terms: -12 + 12 = 0
0 + 2x = -6 + 12
2x = -6 + 12

Combine like terms: -6 + 12 = 6
2x = 6

Divide each side by '2'.
x = 3

Simplifying
x = 3

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