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x in (-oo:+oo)
(1/7)*x = 142857 // - 142857
(1/7)*x-142857 = 0
1/7*x-142857 = 0 // + 142857
1/7*x = 142857 // : 1/7
x = 142857/1/7
x = 999999
x = 999999
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