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w in (-oo:+oo)
(1/5)*(w+750) = 290 // - 290
(1/5)*(w+750)-290 = 0
1/5*(w+750)-290 = 0
1/5*(w+750)-290 = 0
1/5*w-140 = 0
1/5*w-140 = 0
1/5*w-140 = 0 // + 140
1/5*w = 140 // : 1/5
w = 140/1/5
w = 700
w = 700
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