x^2=4/9x

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Solution for x^2=4/9x equation: 


x in (-oo:+oo)

x^2 = (4/9)*x // - (4/9)*x

x^2-((4/9)*x) = 0

x^2+(-4/9)*x = 0

x^2-4/9*x = 0

DELTA = (-4/9)^2-(0*1*4)

DELTA = 16/81

DELTA > 0

x = ((16/81)^(1/2)+4/9)/(1*2) or x = (4/9-(16/81)^(1/2))/(1*2)

x = 4/9 or x = 0

x in { 0, 4/9 }

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