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v in (-oo:+oo)
-10 = v/12-9 // - v/12-9
9-(v/12)-10 = 0
-1/12*v-1 = 0 // + 1
-1/12*v = 1 // : -1/12
v = 1/(-1/12)
v = -12
v = -12
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