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x in (-oo:+oo)
-23 = (2/5)*x // - (2/5)*x
-((2/5)*x)-23 = 0
(-2/5)*x-23 = 0
-2/5*x-23 = 0 // + 23
-2/5*x = 23 // : -2/5
x = 23/(-2/5)
x = -115/2
x = -115/2
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