-w+4(w+3)=21

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Solution for -w+4(w+3)=21 equation:


Simplifying
-1w + 4(w + 3) = 21

Reorder the terms:
-1w + 4(3 + w) = 21
-1w + (3 * 4 + w * 4) = 21
-1w + (12 + 4w) = 21

Reorder the terms:
12 + -1w + 4w = 21

Combine like terms: -1w + 4w = 3w
12 + 3w = 21

Solving
12 + 3w = 21

Solving for variable 'w'.

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

Add '-12' to each side of the equation.
12 + -12 + 3w = 21 + -12

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

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

Divide each side by '3'.
w = 3

Simplifying
w = 3

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