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