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t in (-oo:+oo)
(6/7)*t-(1/3) = 5/147 // - 5/147
(6/7)*t-(1/3)-(5/147) = 0
(6/7)*t-1/3-5/147 = 0
6/7*t-18/49 = 0 // + 18/49
6/7*t = 18/49 // : 6/7
t = 18/49/6/7
t = 3/7
t = 3/7
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