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t in (-oo:+oo)
42/5 = (6/5)*(t+1) // - (6/5)*(t+1)
42/5-((6/5)*(t+1)) = 0
(-6/5)*(t+1)+42/5 = 0
42/5-6/5*(t+1) = 0
(-6/5*5*(t+1))/5+42/5 = 0
42-6/5*5*(t+1) = 0
36-6*t = 0
(36-6*t)/5 = 0
(36-6*t)/5 = 0 // * 5
36-6*t = 0
36-6*t = 0 // - 36
-6*t = -36 // : -6
t = -36/(-6)
t = 6
t = 6
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