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v in (-oo:+oo)
8-((1/7)*v) = -19 // + 19
8-((1/7)*v)+19 = 0
(-1/7)*v+8+19 = 0
27-1/7*v = 0 // - 27
-1/7*v = -27 // : -1/7
v = -27/(-1/7)
v = 189
v = 189
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