5/15=x/21

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Solution for 5/15=x/21 equation: 


x in (-oo:+oo)

5/15 = x/21 // - x/21

5/15-(x/21) = 0

1/3-1/21*x = 0 // - 1/3

-1/21*x = -1/3 // : -1/21

x = -1/3/(-1/21)

x = 7

x = 7

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