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t in (-oo:+oo)
54/42 = t/14 // - t/14
54/42-(t/14) = 0
9/7-1/14*t = 0 // - 9/7
-1/14*t = -9/7 // : -1/14
t = -9/7/(-1/14)
t = 18
t = 18
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