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v in (-oo:+oo)
v/10-(v/8) = 7/10 // - 7/10
v/10-(v/8)-(7/10) = 0
v/10-(v/8)-7/10 = 0
-1/40*v-7/10 = 0 // + 7/10
-1/40*v = 7/10 // : -1/40
v = 7/10/(-1/40)
v = -28
v = -28
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