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t in (-oo:+oo)
2-(4*t) = 5*t-7 // - 5*t-7
2-(4*t)-(5*t)+7 = 0
2-4*t-5*t+7 = 0
9-9*t = 0 // - 9
-9*t = -9 // : -9
t = -9/(-9)
t = 1
t = 1
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