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t in (-oo:+oo)
39/5 = 2*t-t+4/5 // - 2*t-t+4/5
t-(2*t)+39/5-(4/5) = 0
t-2*t+39/5-4/5 = 0
7-t = 0 // - 7
-t = -7 // * -1
t = 7
t = 7
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