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2*x-((3*x^2)/36) = 0
(-1/12)*x^2+2*x = 0
2*x-1/12*x^2 = 0
DELTA = 2^2-(-1/12*0*4)
DELTA = 4
DELTA > 0
x = (4^(1/2)-2)/(-1/12*2) or x = (-4^(1/2)-2)/(-1/12*2)
x = 0 or x = 24
x in { 0, 24 }
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