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t in (-oo:+oo)
2-7*t = 4/9 // - 4/9
2-7*t-(4/9) = 0
2-7*t-4/9 = 0
14/9-7*t = 0 // - 14/9
-7*t = -14/9 // : -7
t = -14/9/(-7)
t = 2/9
t = 2/9
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