21-6-3w=-12

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Solution for 21-6-3w=-12 equation: 


Simplifying
21 + -6 + -3w = -12

Combine like terms: 21 + -6 = 15
15 + -3w = -12

Solving
15 + -3w = -12

Solving for variable 'w'.

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

Add '-15' to each side of the equation.
15 + -15 + -3w = -12 + -15

Combine like terms: 15 + -15 = 0
0 + -3w = -12 + -15
-3w = -12 + -15

Combine like terms: -12 + -15 = -27
-3w = -27

Divide each side by '-3'.
w = 9

Simplifying
w = 9

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