[-3x-12]=9

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Solution for [-3x-12]=9 equation:


Simplifying
[-3x + -12] = 9

Reorder the terms:
[-12 + -3x] = 9

Remove brackets around [-12 + -3x]
-12 + -3x = 9

Solving
-12 + -3x = 9

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 + -3x = 9 + 12

Combine like terms: -12 + 12 = 0
0 + -3x = 9 + 12
-3x = 9 + 12

Combine like terms: 9 + 12 = 21
-3x = 21

Divide each side by '-3'.
x = -7

Simplifying
x = -7

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