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w in (-oo:+oo)
4*(5*w-4) = 124 // - 124
4*(5*w-4)-124 = 0
4*(5*w-4)-124 = 0
20*w-140 = 0
20*w-140 = 0
20*w-140 = 0 // + 140
20*w = 140 // : 20
w = 140/20
w = 7
w = 7
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