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(7*t+1)/3 = (t+9)/6+(t-7)/6 // - (t+9)/6+(t-7)/6
(7*t+1)/3-((t+9)/6)-((t-7)/6) = 0
(7*t+1)/3+(-1*(t+9))/6+(-1*(t-7))/6 = 0
(6*(7*t+1))/(3*6)+(-1*3*(t+9))/(3*6)+(-1*3*(t-7))/(3*6) = 0
6*(7*t+1)-1*3*(t+9)-1*3*(t-7) = 0
39*t-3*t-21+21 = 0
36*t = 0
(36*t)/(3*6) = 0
(36*t)/(3*6) = 0 // * 3*6
36*t = 0
36*t = 0 // : 36
t = 0
t = 0
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