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4*x-(((1*x)/3)*x) = 5 // - 5
4*x-(((1*x)/3)*x)-5 = 0
(-1/3)*x^2+4*x-5 = 0
4*x-1/3*x^2-5 = 0
DELTA = 4^2-(-5*(-1/3)*4)
DELTA = 28/3
DELTA > 0
x = ((28/3)^(1/2)-4)/(-1/3*2) or x = (-(28/3)^(1/2)-4)/(-1/3*2)
x = -3/2*((28/3)^(1/2)-4) or x = 3/2*((28/3)^(1/2)+4)
x in { -3/2*((28/3)^(1/2)-4), 3/2*((28/3)^(1/2)+4) }
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