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3*x^2-(10*x) = 299/3 // - 299/3
3*x^2-(10*x)-(299/3) = 0
3*x^2-10*x-299/3 = 0
3*x^2-10*x-299/3 = 0
DELTA = (-10)^2-(-299/3*3*4)
DELTA = 1296
DELTA > 0
x = (1296^(1/2)+10)/(2*3) or x = (10-1296^(1/2))/(2*3)
x = 23/3 or x = -13/3
x in { -13/3, 23/3 }
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