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x in (-oo:+oo)
(4*x)/5 = 5/4 // - 5/4
(4*x)/5-(5/4) = 0
(4*x)/5-5/4 = 0
4/5*x-5/4 = 0 // + 5/4
4/5*x = 5/4 // : 4/5
x = 5/4/4/5
x = 25/16
x = 25/16
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