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x in (-oo:+oo)
10 = (-5/4)*x // - (-5/4)*x
10-((-5/4)*x) = 0
(5/4)*x+10 = 0
5/4*x+10 = 0 // - 10
5/4*x = -10 // : 5/4
x = -10/5/4
x = -8
x = -8
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