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x in (-oo:+oo)
(-5/4)*x = 5/28 // - 5/28
(-5/4)*x-(5/28) = 0
(-5/4)*x-5/28 = 0
-5/4*x-5/28 = 0 // + 5/28
-5/4*x = 5/28 // : -5/4
x = 5/28/(-5/4)
x = -1/7
x = -1/7
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