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t in (-oo:+oo)
t/9 = 10/15 // - 10/15
t/9-(10/15) = 0
t/9-2/3 = 0
1/9*t-2/3 = 0 // + 2/3
1/9*t = 2/3 // : 1/9
t = 2/3/1/9
t = 6
t = 6
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