-x/y=21

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Solution for -x/y=21 equation: 


x in (-oo:+oo)

-x/y = 21 // - 21

-x/y-21 = 0

x*(-y^-1)-21 = 0 // + 21

x*(-y^-1) = 21 // : -y^-1

x = 21/(-y^-1)

x = 21/(-y^-1)

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