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t in (-oo:+oo)
11 = 5*t+4*t+2 // - 5*t+4*t+2
11-(5*t)-(4*t)-2 = 0
11-5*t-4*t-2 = 0
9-9*t = 0 // - 9
-9*t = -9 // : -9
t = -9/(-9)
t = 1
t = 1
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