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t in (-oo:+oo)
18/8 = t/12 // - t/12
18/8-(t/12) = 0
9/4-1/12*t = 0 // - 9/4
-1/12*t = -9/4 // : -1/12
t = -9/4/(-1/12)
t = 27
t = 27
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