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t in (-oo:+oo)
2*t-(5/(-9)) = -7 // + 7
2*t-(5/(-9))+7 = 0
2*t+5/9+7 = 0
2*t+68/9 = 0 // - 68/9
2*t = -68/9 // : 2
t = -68/9/2
t = -34/9
t = -34/9
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