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