-21+-3x=-9

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


Simplifying
-21 + -3x = -9

Solving
-21 + -3x = -9

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 = -9 + 21

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

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

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

Simplifying
x = -4

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