9+2w=21

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Solution for 9+2w=21 equation: 


w in (-oo:+oo)

2*w+9 = 21 // - 21

2*w-21+9 = 0

2*w-12 = 0 // + 12

2*w = 12 // : 2

w = 12/2

w = 6

w = 6

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