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t in (-oo:+oo)
-56 = 6*t+3*t+7 // - 6*t+3*t+7
-(6*t)-(3*t)-56-7 = 0
-6*t-3*t-56-7 = 0
-9*t-63 = 0 // + 63
-9*t = 63 // : -9
t = 63/(-9)
t = -7
t = -7
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