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x in (-oo:+oo)
-20 = (5/2)*x // - (5/2)*x
-((5/2)*x)-20 = 0
(-5/2)*x-20 = 0
-5/2*x-20 = 0 // + 20
-5/2*x = 20 // : -5/2
x = 20/(-5/2)
x = -8
x = -8
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