3/7-x/3=5/21

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Solution for 3/7-x/3=5/21 equation: 


x in (-oo:+oo)

3/7-(x/3) = 5/21 // - 5/21

3/7-(x/3)-(5/21) = 0

3/7-(x/3)-5/21 = 0

4/21-1/3*x = 0 // - 4/21

-1/3*x = -4/21 // : -1/3

x = -4/21/(-1/3)

x = 4/7

x = 4/7

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