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t in (-oo:+oo)
5*(8-1*t) = 40 // - 40
5*(8-1*t)-40 = 0
5*(8-t)-40 = 0
5*(8-t)-40 = 0
-5*t = 0
-5*t = 0
-5*t = 0 // : -5
t = 0
t = 0
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