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t in (-oo:+oo)
4*t-(5/(-9)) = 7 // - 7
4*t-(5/(-9))-7 = 0
4*t+5/9-7 = 0
4*t-58/9 = 0 // + 58/9
4*t = 58/9 // : 4
t = 58/9/4
t = 29/18
t = 29/18
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