4/7-4/5x=5/21

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Solution for 4/7-4/5x=5/21 equation: 


x in (-oo:+oo)

4/7-((4/5)*x) = 5/21 // - 5/21

4/7-((4/5)*x)-(5/21) = 0

(-4/5)*x+4/7-5/21 = 0

1/3-4/5*x = 0 // - 1/3

-4/5*x = -1/3 // : -4/5

x = -1/3/(-4/5)

x = 5/12

x = 5/12

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