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t in (-oo:+oo)
7-4*t-(5*t) = -20 // + 20
7-4*t-(5*t)+20 = 0
7-4*t-5*t+20 = 0
27-9*t = 0 // - 27
-9*t = -27 // : -9
t = -27/(-9)
t = 3
t = 3
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