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