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t in (-oo:+oo)
(4/7)*t-(5*t)+7/10 = 373/90 // - 373/90
(4/7)*t-(5*t)+7/10-(373/90) = 0
(4/7)*t-5*t+7/10-373/90 = 0
-31/7*t-31/9 = 0 // + 31/9
-31/7*t = 31/9 // : -31/7
t = 31/9/(-31/7)
t = -7/9
t = -7/9
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