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w in (-oo:+oo)
7*w+5 = 75-7*w // - 75-7*w
7*w-(-7*w)-75+5 = 0
7*w+7*w-75+5 = 0
14*w-70 = 0 // + 70
14*w = 70 // : 14
w = 70/14
w = 5
w = 5
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