20/21=x/3x-6

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Solution for 20/21=x/3x-6 equation: 


x in (-oo:+oo)

20/21 = (x/3)*x-6 // - (x/3)*x-6

20/21-((x/3)*x)+6 = 0

(-1/3)*x^2+20/21+6 = 0

-1/3*x^2 = -146/21 // : -1/3

x^2 = 146/7

x^2 = 146/7 // ^ 1/2

abs(x) = (146/7)^(1/2)

x = (146/7)^(1/2) or x = -(146/7)^(1/2)

x in { (146/7)^(1/2), -(146/7)^(1/2) }

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