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