-3x-9=-21

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Solution for -3x-9=-21 equation: 


Simplifying
-3x + -9 = -21

Reorder the terms:
-9 + -3x = -21

Solving
-9 + -3x = -21

Solving for variable 'x'.

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

Add '9' to each side of the equation.
-9 + 9 + -3x = -21 + 9

Combine like terms: -9 + 9 = 0
0 + -3x = -21 + 9
-3x = -21 + 9

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

Divide each side by '-3'.
x = 4

Simplifying
x = 4

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