2w+-9=21

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Solution for 2w+-9=21 equation: 


Simplifying
2w + -9 = 21

Reorder the terms:
-9 + 2w = 21

Solving
-9 + 2w = 21

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 + 2w = 21 + 9

Combine like terms: -9 + 9 = 0
0 + 2w = 21 + 9
2w = 21 + 9

Combine like terms: 21 + 9 = 30
2w = 30

Divide each side by '2'.
w = 15

Simplifying
w = 15

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