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x in (-oo:+oo)
-((5/2)*x) = 25 // - 25
-((5/2)*x)-25 = 0
(-5/2)*x-25 = 0
-5/2*x-25 = 0 // + 25
-5/2*x = 25 // : -5/2
x = 25/(-5/2)
x = -10
x = -10
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