21=-7w+2(w+8)

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Solution for 21=-7w+2(w+8) equation:


Simplifying
21 = -7w + 2(w + 8)

Reorder the terms:
21 = -7w + 2(8 + w)
21 = -7w + (8 * 2 + w * 2)
21 = -7w + (16 + 2w)

Reorder the terms:
21 = 16 + -7w + 2w

Combine like terms: -7w + 2w = -5w
21 = 16 + -5w

Solving
21 = 16 + -5w

Solving for variable 'w'.

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

Add '5w' to each side of the equation.
21 + 5w = 16 + -5w + 5w

Combine like terms: -5w + 5w = 0
21 + 5w = 16 + 0
21 + 5w = 16

Add '-21' to each side of the equation.
21 + -21 + 5w = 16 + -21

Combine like terms: 21 + -21 = 0
0 + 5w = 16 + -21
5w = 16 + -21

Combine like terms: 16 + -21 = -5
5w = -5

Divide each side by '5'.
w = -1

Simplifying
w = -1

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