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t in (-oo:+oo)
61 = 6*t+4*t-9 // - 6*t+4*t-9
9-(6*t)-(4*t)+61 = 0
9-6*t-4*t+61 = 0
70-10*t = 0 // - 70
-10*t = -70 // : -10
t = -70/(-10)
t = 7
t = 7
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