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t in (-oo:+oo)
26 = 2*t+3*t+6 // - 2*t+3*t+6
26-(2*t)-(3*t)-6 = 0
26-2*t-3*t-6 = 0
20-5*t = 0 // - 20
-5*t = -20 // : -5
t = -20/(-5)
t = 4
t = 4
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