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x in (-oo:+oo)
-47 = -x/y // + -x/y
-(-x/y)-47 = 0
x*y^-1-47 = 0
x*y^-1-47 = 0 // + 47
x*y^-1 = 47 // : y^-1
x = 47/(y^-1)
x = 47/(y^-1)
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