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v in (-oo:+oo)
v/(-8)+6 = 4/7 // - 4/7
v/(-8)-(4/7)+6 = 0
v/(-8)-4/7+6 = 0
38/7-1/8*v = 0 // - 38/7
-1/8*v = -38/7 // : -1/8
v = -38/7/(-1/8)
v = 304/7
v = 304/7
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