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t in (-oo:+oo)
9-7*t = 3*t+69 // - 3*t+69
9-7*t-(3*t)-69 = 0
9-7*t-3*t-69 = 0
-10*t-60 = 0 // + 60
-10*t = 60 // : -10
t = 60/(-10)
t = -6
t = -6
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