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