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v in (-oo:+oo)
v/3-(7/12) = v/4 // - v/4
v/3-(v/4)-(7/12) = 0
v/3-(v/4)-7/12 = 0
1/12*v-7/12 = 0 // + 7/12
1/12*v = 7/12 // : 1/12
v = 7/12/1/12
v = 7
v = 7
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