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v in (-oo:+oo)
((7*v-2)^1)/4+12 = 7 // - 7
((7*v-2)^1)/4-7+12 = 0
(7*v-2)/4-7+12 = 0
(7*v-2)/4+(-7*4)/4+(4*12)/4 = 0
7*v-7*4+4*12-2 = 0
7*v-30+48 = 0
7*v+18 = 0
(7*v+18)/4 = 0
(7*v+18)/4 = 0 // * 4
7*v+18 = 0
7*v+18 = 0 // - 18
7*v = -18 // : 7
v = -18/7
v = -18/7
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