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t in (-oo:+oo)
(1/5)*(5*t-4) = t+4/10 // - t+4/10
(1/5)*(5*t-4)-t-(4/10) = 0
(1/5)*(5*t-4)-t-2/5 = 0
1/5*(5*t-4)-t-2/5 = 0
(1/5*5*(5*t-4))/5+(5*(-t))/5-2/5 = 0
1/5*5*(5*t-4)+5*(-t)-2 = 0
-4-2 = 0
-6 = 0
-6/5 = 0
-6/5 = 0 // * 5
-6 = 0
t belongs to the empty set
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