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v in (-oo:+oo)
-50 = -v/7 // + -v/7
-(-v/7)-50 = 0
(1/7)*v-50 = 0
1/7*v-50 = 0 // + 50
1/7*v = 50 // : 1/7
v = 50/1/7
v = 350
v = 350
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