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t in (-oo:+oo)
(3/5)*t+7*t-(4/9) = 322/45 // - 322/45
(3/5)*t+7*t-(4/9)-(322/45) = 0
(3/5)*t+7*t-4/9-322/45 = 0
38/5*t-38/5 = 0 // + 38/5
38/5*t = 38/5 // : 38/5
t = 38/5/38/5
t = 1
t = 1
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