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t in (-oo:+oo)
(4/5)*(t+7) = 12/5-t // - 12/5-t
(4/5)*(t+7)+t-(12/5) = 0
(4/5)*(t+7)+t-12/5 = 0
4/5*(t+7)+t-12/5 = 0
(4/5*5*(t+7))/5+(5*t)/5-12/5 = 0
4/5*5*(t+7)+5*t-12 = 0
9*t-12+28 = 0
9*t+16 = 0
(9*t+16)/5 = 0
(9*t+16)/5 = 0 // * 5
9*t+16 = 0
9*t+16 = 0 // - 16
9*t = -16 // : 9
t = -16/9
t = -16/9
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