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t in (-oo:+oo)
7 = 7*t-2*t+2 // - 7*t-2*t+2
7-(-2*t)-(7*t)-2 = 0
2*t-7*t-2+7 = 0
5-5*t = 0 // - 5
-5*t = -5 // : -5
t = -5/(-5)
t = 1
t = 1
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