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x in (-oo:+oo)
8-x = -20/y // + -20/y
8-x-(-20/y) = 0
20*y^-1-x+8 = 0
20*y^-1-x+8 = 0 // - 20*y^-1+8
-x = -(20*y^-1+8) // * -1
x = 20*y^-1+8
x = 20*y^-1+8
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