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t in (-oo:+oo)
7*(3-(5*t)) = 21 // - 21
7*(3-(5*t))-21 = 0
7*(3-5*t)-21 = 0
7*(3-5*t)-21 = 0
-35*t = 0
-35*t = 0
-35*t = 0 // : -35
t = 0
t = 0
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