4=x-6/21

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Solution for 4=x-6/21 equation: 


x in (-oo:+oo)

4 = x-(6/21) // - x-(6/21)

6/21-x+4 = 0

30/7-x = 0 // - 30/7

-x = -30/7 // * -1

x = 30/7

x = 30/7

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