9/21=x/28

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Solution for 9/21=x/28 equation: 


x in (-oo:+oo)

9/21 = x/28 // - x/28

9/21-(x/28) = 0

3/7-1/28*x = 0 // - 3/7

-1/28*x = -3/7 // : -1/28

x = -3/7/(-1/28)

x = 12

x = 12

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