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t in (-oo:+oo)
2*t+3 = 38-5*t // - 38-5*t
2*t-(-5*t)-38+3 = 0
2*t+5*t-38+3 = 0
7*t-35 = 0 // + 35
7*t = 35 // : 7
t = 35/7
t = 5
t = 5
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