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x in (-oo:+oo)
(5/7)*x = 15/49 // - 15/49
(5/7)*x-(15/49) = 0
(5/7)*x-15/49 = 0
5/7*x-15/49 = 0 // + 15/49
5/7*x = 15/49 // : 5/7
x = 15/49/5/7
x = 3/7
x = 3/7
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