15-w=3w-21

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Solution for 15-w=3w-21 equation:


Simplifying
15 + -1w = 3w + -21

Reorder the terms:
15 + -1w = -21 + 3w

Solving
15 + -1w = -21 + 3w

Solving for variable 'w'.

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

Add '-3w' to each side of the equation.
15 + -1w + -3w = -21 + 3w + -3w

Combine like terms: -1w + -3w = -4w
15 + -4w = -21 + 3w + -3w

Combine like terms: 3w + -3w = 0
15 + -4w = -21 + 0
15 + -4w = -21

Add '-15' to each side of the equation.
15 + -15 + -4w = -21 + -15

Combine like terms: 15 + -15 = 0
0 + -4w = -21 + -15
-4w = -21 + -15

Combine like terms: -21 + -15 = -36
-4w = -36

Divide each side by '-4'.
w = 9

Simplifying
w = 9

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