7x-21x^2/7x

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Solution for 7x-21x^2/7x equation: 


x in (-oo:+oo)

7*x-(x*((21*x^2)/7)) = 0

7*x-3*x^3 = 0

7*x-3*x^3 = 0

x*(7-3*x^2) = 0

-3*x^2 = -7 // : -3

x^2 = 7/3

x^2 = 7/3 // ^ 1/2

abs(x) = (7/3)^(1/2)

x = (7/3)^(1/2) or x = -(7/3)^(1/2)

x = 0

x = 0

x in { (7/3)^(1/2), -(7/3)^(1/2), 0 }

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