x/7*x=2x

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Solution for x/7*x=2x equation: 


x in (-oo:+oo)

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

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

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

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

DELTA = (-2)^2-(0*1/7*4)

DELTA = 4

DELTA > 0

x = (4^(1/2)+2)/(1/7*2) or x = (2-4^(1/2))/(1/7*2)

x = 14 or x = 0

x in { 0, 14 }

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