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t in (-oo:+oo)
8-6*t-(7*t) = -44 // + 44
8-6*t-(7*t)+44 = 0
8-6*t-7*t+44 = 0
52-13*t = 0 // - 52
-13*t = -52 // : -13
t = -52/(-13)
t = 4
t = 4
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