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t in (-oo:+oo)
5-5*t-(5*t) = -45 // + 45
5-5*t-(5*t)+45 = 0
5-5*t-5*t+45 = 0
50-10*t = 0 // - 50
-10*t = -50 // : -10
t = -50/(-10)
t = 5
t = 5
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