1/3-x/7=1/21

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Solution for 1/3-x/7=1/21 equation: 


x in (-oo:+oo)

1/3-(x/7) = 1/21 // - 1/21

1/3-(x/7)-(1/21) = 0

1/3-(x/7)-1/21 = 0

2/7-1/7*x = 0 // - 2/7

-1/7*x = -2/7 // : -1/7

x = -2/7/(-1/7)

x = 2

x = 2

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