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t in (-oo:+oo)
t/15 = 6/18 // - 6/18
t/15-(6/18) = 0
t/15-1/3 = 0
1/15*t-1/3 = 0 // + 1/3
1/15*t = 1/3 // : 1/15
t = 1/3/1/15
t = 5
t = 5
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