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v in (-oo:+oo)
(5/2)*(3*v-4) = 30 // - 30
(5/2)*(3*v-4)-30 = 0
5/2*(3*v-4)-30 = 0
5/2*(3*v-4)-30 = 0
15/2*v-40 = 0
15/2*v-40 = 0
15/2*v-40 = 0 // + 40
15/2*v = 40 // : 15/2
v = 40/15/2
v = 16/3
v = 16/3
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