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