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t in (-oo:+oo)
84 = 6*t+7*t-7 // - 6*t+7*t-7
7-(6*t)-(7*t)+84 = 0
7-6*t-7*t+84 = 0
91-13*t = 0 // - 91
-13*t = -91 // : -13
t = -91/(-13)
t = 7
t = 7
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