3x-12=(-21)

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Solution for 3x-12=(-21) equation: 


Simplifying
3x + -12 = (-21)

Reorder the terms:
-12 + 3x = (-21)
-12 + 3x = -21

Solving
-12 + 3x = -21

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 = -21 + 12

Combine like terms: -12 + 12 = 0
0 + 3x = -21 + 12
3x = -21 + 12

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

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

Simplifying
x = -3

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