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t in (-oo:+oo)
7*t+5 = 3*t+49 // - 3*t+49
7*t-(3*t)-49+5 = 0
7*t-3*t-49+5 = 0
4*t-44 = 0 // + 44
4*t = 44 // : 4
t = 44/4
t = 11
t = 11
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