21=3w-15

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Solution for 21=3w-15 equation:


Simplifying
21 = 3w + -15

Reorder the terms:
21 = -15 + 3w

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

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

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

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

Combine like terms: -15 + -21 = -36
-3w = -36

Divide each side by '-3'.
w = 12

Simplifying
w = 12

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