-3x+21=-18

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Solution for -3x+21=-18 equation: 


Simplifying
-3x + 21 = -18

Reorder the terms:
21 + -3x = -18

Solving
21 + -3x = -18

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 + -3x = -18 + -21

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

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

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

Simplifying
x = 13

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