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t in (-oo:+oo)
3*t-(5*t)+2 = -20 // + 20
3*t-(5*t)+2+20 = 0
3*t-5*t+2+20 = 0
22-2*t = 0 // - 22
-2*t = -22 // : -2
t = -22/(-2)
t = 11
t = 11
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