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x in (-oo:+oo)
(4/5)*x = 5/7 // - 5/7
(4/5)*x-(5/7) = 0
(4/5)*x-5/7 = 0
4/5*x-5/7 = 0 // + 5/7
4/5*x = 5/7 // : 4/5
x = 5/7/4/5
x = 25/28
x = 25/28
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