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t in (-oo:+oo)
-21/2 = t/10 // - t/10
-(t/10)-21/2 = 0
-1/10*t-21/2 = 0 // + 21/2
-1/10*t = 21/2 // : -1/10
t = 21/2/(-1/10)
t = -105
t = -105
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