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t in (-oo:+oo)
35 = 3*t+7*t-5 // - 3*t+7*t-5
5-(3*t)-(7*t)+35 = 0
5-3*t-7*t+35 = 0
40-10*t = 0 // - 40
-10*t = -40 // : -10
t = -40/(-10)
t = 4
t = 4
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