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w in (-oo:+oo)
(1/2)*(8*w-6) = 17 // - 17
(1/2)*(8*w-6)-17 = 0
1/2*(8*w-6)-17 = 0
1/2*(8*w-6)-17 = 0
4*w-20 = 0
4*w-20 = 0
4*w-20 = 0 // + 20
4*w = 20 // : 4
w = 20/4
w = 5
w = 5
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