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t in (-oo:+oo)
(3/5)*(t+18) = 3*(2-t) // - 3*(2-t)
(3/5)*(t+18)-(3*(2-t)) = 0
(3/5)*(t+18)-3*(2-t) = 0
3/5*(t+18)-3*(2-t) = 0
3/5*(t+18)-3*(2-t) = 0
18/5*t+24/5 = 0
18/5*t+24/5 = 0
18/5*t+24/5 = 0 // - 24/5
18/5*t = -24/5 // : 18/5
t = -24/5/18/5
t = -4/3
t = -4/3
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