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t in (-oo:+oo)
4*t+2/5 = 38/45 // - 38/45
4*t+2/5-(38/45) = 0
4*t+2/5-38/45 = 0
4*t-4/9 = 0 // + 4/9
4*t = 4/9 // : 4
t = 4/9/4
t = 1/9
t = 1/9
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