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t in (-oo:+oo)
10-3*t = 6*t-89 // - 6*t-89
10-3*t-(6*t)+89 = 0
10-3*t-6*t+89 = 0
99-9*t = 0 // - 99
-9*t = -99 // : -9
t = -99/(-9)
t = 11
t = 11
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