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t in (-oo:+oo)
18 = 4*t+t-2 // - 4*t+t-2
2-(4*t)-t+18 = 0
2-4*t-t+18 = 0
20-5*t = 0 // - 20
-5*t = -20 // : -5
t = -20/(-5)
t = 4
t = 4
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