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t in (-oo:+oo)
2*t+9 = 34-3*t // - 34-3*t
2*t-(-3*t)-34+9 = 0
2*t+3*t-34+9 = 0
5*t-25 = 0 // + 25
5*t = 25 // : 5
t = 25/5
t = 5
t = 5
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