9w-21=-3(w-5)

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Solution for 9w-21=-3(w-5) equation:


Simplifying
9w + -21 = -3(w + -5)

Reorder the terms:
-21 + 9w = -3(w + -5)

Reorder the terms:
-21 + 9w = -3(-5 + w)
-21 + 9w = (-5 * -3 + w * -3)
-21 + 9w = (15 + -3w)

Solving
-21 + 9w = 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 + 9w + 3w = 15 + -3w + 3w

Combine like terms: 9w + 3w = 12w
-21 + 12w = 15 + -3w + 3w

Combine like terms: -3w + 3w = 0
-21 + 12w = 15 + 0
-21 + 12w = 15

Add '21' to each side of the equation.
-21 + 21 + 12w = 15 + 21

Combine like terms: -21 + 21 = 0
0 + 12w = 15 + 21
12w = 15 + 21

Combine like terms: 15 + 21 = 36
12w = 36

Divide each side by '12'.
w = 3

Simplifying
w = 3

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