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t in (-oo:+oo)
1-5*t = 6*t+100 // - 6*t+100
1-5*t-(6*t)-100 = 0
1-5*t-6*t-100 = 0
-11*t-99 = 0 // + 99
-11*t = 99 // : -11
t = 99/(-11)
t = -9
t = -9
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