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t in (-oo:+oo)
2 = 7*t-(4*t)-10 // - 7*t-(4*t)-10
4*t-(7*t)+2+10 = 0
4*t-7*t+2+10 = 0
12-3*t = 0 // - 12
-3*t = -12 // : -3
t = -12/(-3)
t = 4
t = 4
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