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x in (-oo:+oo)
x*((-5*y)/2) = 10 // - 10
x*((-5*y)/2)-10 = 0
-5/2*x*y-10 = 0 // + 10
-5/2*x*y = 10 // : -5/2*y
x = 10/(-5/2*y)
x = -4*y^-1
x = -4*y^-1
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