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v in (-oo:+oo)
3/10-(4*v) = 18/10 // - 18/10
3/10-(4*v)-(18/10) = 0
3/10-4*v-9/5 = 0
-4*v-3/2 = 0 // + 3/2
-4*v = 3/2 // : -4
v = 3/2/(-4)
v = -3/8
v = -3/8
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