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v in (-oo:+oo)
-((2/7)*v)-10 = 2 // - 2
-((2/7)*v)-10-2 = 0
(-2/7)*v-10-2 = 0
-2/7*v-12 = 0 // + 12
-2/7*v = 12 // : -2/7
v = 12/(-2/7)
v = -42
v = -42
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