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t in (-oo:+oo)
(3/5)*(t-1) = 18 // - 18
(3/5)*(t-1)-18 = 0
3/5*(t-1)-18 = 0
3/5*(t-1)-18 = 0
3/5*t-93/5 = 0
3/5*t-93/5 = 0
3/5*t-93/5 = 0 // + 93/5
3/5*t = 93/5 // : 3/5
t = 93/5/3/5
t = 31
t = 31
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