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t in (-oo:+oo)
12.4/8 = t/10 // - t/10
12.4/8-(t/10) = 0
1.55-1/10*t = 0 // - 1.55
-1/10*t = -1.55 // : -1/10
t = -1.55/(-1/10)
t = 15.5
t = 15.5
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