-9-12=-7x

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Solution for -9-12=-7x equation:


Simplifying
-9 + -12 = -7x

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

Solving
-21 = -7x

Solving for variable 'x'.

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

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

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

Add '21' to each side of the equation.
-21 + 21 + 7x = 0 + 21

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

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

Divide each side by '7'.
x = 3

Simplifying
x = 3

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