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t in (-oo:+oo)
(2/7)*t = 2/7 // - 2/7
(2/7)*t-(2/7) = 0
(2/7)*t-2/7 = 0
2/7*t-2/7 = 0 // + 2/7
2/7*t = 2/7 // : 2/7
t = 2/7/2/7
t = 1
t = 1
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