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t in (-oo:+oo)
7 = 2*t-(5/(-9)) // - 2*t-(5/(-9))
5/(-9)-(2*t)+7 = 0
5/(-9)-2*t+7 = 0
58/9-2*t = 0 // - 58/9
-2*t = -58/9 // : -2
t = -58/9/(-2)
t = 29/9
t = 29/9
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