3x+18=-21

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Solution for 3x+18=-21 equation: 


Simplifying
3x + 18 = -21

Reorder the terms:
18 + 3x = -21

Solving
18 + 3x = -21

Solving for variable 'x'.

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

Add '-18' to each side of the equation.
18 + -18 + 3x = -21 + -18

Combine like terms: 18 + -18 = 0
0 + 3x = -21 + -18
3x = -21 + -18

Combine like terms: -21 + -18 = -39
3x = -39

Divide each side by '3'.
x = -13

Simplifying
x = -13

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