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t in (-oo:+oo)
6/4 = t/10 // - t/10
6/4-(t/10) = 0
3/2-1/10*t = 0 // - 3/2
-1/10*t = -3/2 // : -1/10
t = -3/2/(-1/10)
t = 15
t = 15
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