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x in (-oo:+oo)
-3 = (5/2)*x // - (5/2)*x
-((5/2)*x)-3 = 0
(-5/2)*x-3 = 0
-5/2*x-3 = 0 // + 3
-5/2*x = 3 // : -5/2
x = 3/(-5/2)
x = -6/5
x = -6/5
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