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(4*x^2)/3-((11*x^1)/3) = 20 // - 20
(4*x^2)/3-((11*x^1)/3)-20 = 0
(4*x^2)/3+(-11/3)*x-20 = 0
4/3*x^2-11/3*x-20 = 0
DELTA = (-11/3)^2-(-20*4/3*4)
DELTA = 1081/9
DELTA > 0
x = ((1081/9)^(1/2)+11/3)/(4/3*2) or x = (11/3-(1081/9)^(1/2))/(4/3*2)
x = 3/8*((1081/9)^(1/2)+11/3) or x = 3/8*(11/3-(1081/9)^(1/2))
x in { 3/8*(11/3-(1081/9)^(1/2)), 3/8*((1081/9)^(1/2)+11/3) }
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