(-21/-49)*(7/9)=x

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Solution for (-21/-49)*(7/9)=x equation: 


x in (-oo:+oo)

(-21/(-49))*(7/9) = x // - x

(-21/(-49))*(7/9)-x = 0

1/3-x = 0 // - 1/3

-x = -1/3 // * -1

x = 1/3

x = 1/3

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