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v in (-oo:+oo)
(1/7)*v-(9/5) = -3/2 // + -3/2
(1/7)*v-(9/5)-(-3/2) = 0
(1/7)*v-9/5+3/2 = 0
1/7*v-3/10 = 0 // + 3/10
1/7*v = 3/10 // : 1/7
v = 3/10/1/7
v = 21/10
v = 21/10
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