w+-9=12

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Solution for w+-9=12 equation: 


Simplifying
w + -9 = 12

Reorder the terms:
-9 + w = 12

Solving
-9 + w = 12

Solving for variable 'w'.

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

Add '9' to each side of the equation.
-9 + 9 + w = 12 + 9

Combine like terms: -9 + 9 = 0
0 + w = 12 + 9
w = 12 + 9

Combine like terms: 12 + 9 = 21
w = 21

Simplifying
w = 21

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