x/9=y/21

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Solution for x/9=y/21 equation: 


x in (-oo:+oo)

x/9 = y/21 // - y/21

x/9-(y/21) = 0

1/9*x-1/21*y = 0 // + -1/21*y

1/9*x = -(-1/21*y) // : 1/9

x = (-(-1/21*y))/1/9

x = 3/7*y

x = 3/7*y

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