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t in (-oo:+oo)
(3*(t-7))/2 = t-6 // - t-6
(3*(t-7))/2-t+6 = 0
(3*(t-7))/2+(2*(-t))/2+(2*6)/2 = 0
3*(t-7)+2*(-t)+2*6 = 0
t-21+12 = 0
t-9 = 0
(t-9)/2 = 0
(t-9)/2 = 0 // * 2
t-9 = 0
t-9 = 0 // + 9
t = 9
t = 9
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