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(4*x^2)/3-((13*x^1)/3) = -3 // + 3
(4*x^2)/3-((13*x^1)/3)+3 = 0
(4*x^2)/3+(-13/3)*x+3 = 0
4/3*x^2-13/3*x+3 = 0
DELTA = (-13/3)^2-(4/3*3*4)
DELTA = 25/9
DELTA > 0
x = ((25/9)^(1/2)+13/3)/(4/3*2) or x = (13/3-(25/9)^(1/2))/(4/3*2)
x = 9/4 or x = 1
x in { 1, 9/4 }
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