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(3/4)*x^2 = (4/3)*x // - (4/3)*x
(3/4)*x^2-((4/3)*x) = 0
(3/4)*x^2+(-4/3)*x = 0
3/4*x^2-4/3*x = 0
DELTA = (-4/3)^2-(0*3/4*4)
DELTA = 16/9
DELTA > 0
x = ((16/9)^(1/2)+4/3)/(3/4*2) or x = (4/3-(16/9)^(1/2))/(3/4*2)
x = 16/9 or x = 0
x in { 0, 16/9 }
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