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