21=3(w-3)+7w

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Solution for 21=3(w-3)+7w equation:


Simplifying
21 = 3(w + -3) + 7w

Reorder the terms:
21 = 3(-3 + w) + 7w
21 = (-3 * 3 + w * 3) + 7w
21 = (-9 + 3w) + 7w

Combine like terms: 3w + 7w = 10w
21 = -9 + 10w

Solving
21 = -9 + 10w

Solving for variable 'w'.

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

Add '-10w' to each side of the equation.
21 + -10w = -9 + 10w + -10w

Combine like terms: 10w + -10w = 0
21 + -10w = -9 + 0
21 + -10w = -9

Add '-21' to each side of the equation.
21 + -21 + -10w = -9 + -21

Combine like terms: 21 + -21 = 0
0 + -10w = -9 + -21
-10w = -9 + -21

Combine like terms: -9 + -21 = -30
-10w = -30

Divide each side by '-10'.
w = 3

Simplifying
w = 3

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