12=w-9

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Solution for 12=w-9 equation:


Simplifying
12 = w + -9

Reorder the terms:
12 = -9 + w

Solving
12 = -9 + w

Solving for variable 'w'.

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

Add '-1w' to each side of the equation.
12 + -1w = -9 + w + -1w

Combine like terms: w + -1w = 0
12 + -1w = -9 + 0
12 + -1w = -9

Add '-12' to each side of the equation.
12 + -12 + -1w = -9 + -12

Combine like terms: 12 + -12 = 0
0 + -1w = -9 + -12
-1w = -9 + -12

Combine like terms: -9 + -12 = -21
-1w = -21

Divide each side by '-1'.
w = 21

Simplifying
w = 21

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