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t in (-oo:+oo)
3*t+10 = 7*t+50 // - 7*t+50
3*t-(7*t)-50+10 = 0
3*t-7*t-50+10 = 0
-4*t-40 = 0 // + 40
-4*t = 40 // : -4
t = 40/(-4)
t = -10
t = -10
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