-21=6x-7x-9

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Solution for -21=6x-7x-9 equation:


Simplifying
-21 = 6x + -7x + -9

Reorder the terms:
-21 = -9 + 6x + -7x

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

Solving
-21 = -9 + -1x

Solving for variable 'x'.

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

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

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

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

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

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

Simplifying
x = 12

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