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