w/2+7=21

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Solution for w/2+7=21 equation: 


w in (-oo:+oo)

w/2+7 = 21 // - 21

w/2-21+7 = 0

1/2*w-14 = 0 // + 14

1/2*w = 14 // : 1/2

w = 14/1/2

w = 28

w = 28

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