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t in (-oo:+oo)
10/7 = t/9 // - t/9
10/7-(t/9) = 0
10/7-1/9*t = 0 // - 10/7
-1/9*t = -10/7 // : -1/9
t = -10/7/(-1/9)
t = 90/7
t = 90/7
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