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x in (-oo:+oo)
(1/7)*x = 2/5 // - 2/5
(1/7)*x-(2/5) = 0
(1/7)*x-2/5 = 0
1/7*x-2/5 = 0 // + 2/5
1/7*x = 2/5 // : 1/7
x = 2/5/1/7
x = 14/5
x = 14/5
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