x/21=9/15

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Solution for x/21=9/15 equation: 


x in (-oo:+oo)

x/21 = 9/15 // - 9/15

x/21-(9/15) = 0

x/21-3/5 = 0

1/21*x-3/5 = 0 // + 3/5

1/21*x = 3/5 // : 1/21

x = 3/5/1/21

x = 63/5

x = 63/5

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