12x+21=-15

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Solution for 12x+21=-15 equation: 


Simplifying
12x + 21 = -15

Reorder the terms:
21 + 12x = -15

Solving
21 + 12x = -15

Solving for variable 'x'.

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

Add '-21' to each side of the equation.
21 + -21 + 12x = -15 + -21

Combine like terms: 21 + -21 = 0
0 + 12x = -15 + -21
12x = -15 + -21

Combine like terms: -15 + -21 = -36
12x = -36

Divide each side by '12'.
x = -3

Simplifying
x = -3

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