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t in (-oo:+oo)
4*t-(7*t)+7 = 4 // - 4
4*t-(7*t)-4+7 = 0
4*t-7*t-4+7 = 0
3-3*t = 0 // - 3
-3*t = -3 // : -3
t = -3/(-3)
t = 1
t = 1
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