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