6x-12-7x+21=-21

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Solution for 6x-12-7x+21=-21 equation:


Simplifying
6x + -12 + -7x + 21 = -21

Reorder the terms:
-12 + 21 + 6x + -7x = -21

Combine like terms: -12 + 21 = 9
9 + 6x + -7x = -21

Combine like terms: 6x + -7x = -1x
9 + -1x = -21

Solving
9 + -1x = -21

Solving for variable 'x'.

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

Add '-9' to each side of the equation.
9 + -9 + -1x = -21 + -9

Combine like terms: 9 + -9 = 0
0 + -1x = -21 + -9
-1x = -21 + -9

Combine like terms: -21 + -9 = -30
-1x = -30

Divide each side by '-1'.
x = 30

Simplifying
x = 30

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