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w in (-oo:+oo)
(1/2)*(8*w-6) = 7 // - 7
(1/2)*(8*w-6)-7 = 0
1/2*(8*w-6)-7 = 0
1/2*(8*w-6)-7 = 0
4*w-10 = 0
4*w-10 = 0
4*w-10 = 0 // + 10
4*w = 10 // : 4
w = 10/4
w = 5/2
w = 5/2
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