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x in (-oo:+oo)
(5/4)*x-2 = 4 // - 4
(5/4)*x-4-2 = 0
5/4*x-6 = 0 // + 6
5/4*x = 6 // : 5/4
x = 6/5/4
x = 24/5
x = 24/5
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