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t in (-oo:+oo)
6-((3/5)*t) = 18/5 // - 18/5
6-((3/5)*t)-(18/5) = 0
(-3/5)*t-18/5+6 = 0
12/5-3/5*t = 0 // - 12/5
-3/5*t = -12/5 // : -3/5
t = -12/5/(-3/5)
t = 4
t = 4
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