21=10-w

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Solution for 21=10-w equation:


Simplifying
21 = 10 + -1w

Solving
21 = 10 + -1w

Solving for variable 'w'.

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

Add 'w' to each side of the equation.
21 + w = 10 + -1w + w

Combine like terms: -1w + w = 0
21 + w = 10 + 0
21 + w = 10

Add '-21' to each side of the equation.
21 + -21 + w = 10 + -21

Combine like terms: 21 + -21 = 0
0 + w = 10 + -21
w = 10 + -21

Combine like terms: 10 + -21 = -11
w = -11

Simplifying
w = -11

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