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t in (-oo:+oo)
(4/7)*t-((1/2)*t)+3/10 = 5/14 // - 5/14
(4/7)*t-((1/2)*t)+3/10-(5/14) = 0
(4/7)*t+(-1/2)*t+3/10-5/14 = 0
1/14*t-2/35 = 0 // + 2/35
1/14*t = 2/35 // : 1/14
t = 2/35/1/14
t = 4/5
t = 4/5
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