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v in (-oo:+oo)
12-(v/10) = 9.9 // - 9.9
12-(v/10)-9.9 = 0
2.1-1/10*v = 0 // - 2.1
-1/10*v = -2.1 // : -1/10
v = -2.1/(-1/10)
v = 21
v = 21
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