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t in (-oo:+oo)
5-(3*t) = 7*t+105 // - 7*t+105
5-(3*t)-(7*t)-105 = 0
5-3*t-7*t-105 = 0
-10*t-100 = 0 // + 100
-10*t = 100 // : -10
t = 100/(-10)
t = -10
t = -10
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