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v in (-oo:+oo)
v/8+v/10 = 9/8 // - 9/8
v/8+v/10-(9/8) = 0
v/8+v/10-9/8 = 0
9/40*v-9/8 = 0 // + 9/8
9/40*v = 9/8 // : 9/40
v = 9/8/9/40
v = 5
v = 5
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