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w in (-oo:+oo)
2*w+5 = 82/2 // - 82/2
2*w-(82/2)+5 = 0
2*w-41+5 = 0
2*w-36 = 0 // + 36
2*w = 36 // : 2
w = 36/2
w = 18
w = 18
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