7/21=a/18

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Solution for 7/21=a/18 equation: 


a in (-oo:+oo)

7/21 = a/18 // - a/18

7/21-(a/18) = 0

1/3-1/18*a = 0 // - 1/3

-1/18*a = -1/3 // : -1/18

a = -1/3/(-1/18)

a = 6

a = 6

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