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v in (-oo:+oo)
7*v = -3/4 // + -3/4
7*v-(-3/4) = 0
7*v+3/4 = 0
7*v+3/4 = 0 // - 3/4
7*v = -3/4 // : 7
v = -3/4/7
v = -3/28
v = -3/28
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