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t in (-oo:+oo)
4*(10-1*t) = 40 // - 40
4*(10-1*t)-40 = 0
4*(10-t)-40 = 0
4*(10-t)-40 = 0
-4*t = 0
-4*t = 0
-4*t = 0 // : -4
t = 0
t = 0
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