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x in (-oo:+oo)
(5/4)*x = 15/20 // - 15/20
(5/4)*x-(15/20) = 0
(5/4)*x-3/4 = 0
5/4*x-3/4 = 0 // + 3/4
5/4*x = 3/4 // : 5/4
x = 3/4/5/4
x = 3/5
x = 3/5
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