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t in (-oo:+oo)
(3/6)*(t-5)-((1/5)*(7-t))+2*t-1 = 0
(3/6)*(t-5)+(-1/5)*(7-t)+2*t-1 = 0
1/2*(t-5)-1/5*(7-t)+2*t-1 = 0
1/2*(t-5)-1/5*(7-t)+2*t-1 = 0
7/10*t+2*t-39/10-1 = 0
27/10*t-39/10-1 = 0
27/10*t-49/10 = 0
27/10*t-49/10 = 0
27/10*t-49/10 = 0 // + 49/10
27/10*t = 49/10 // : 27/10
t = 49/10/27/10
t = 49/27
t = 49/27
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