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