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x in (-oo:+oo)
x^2-((36/3)*x) = 0
x^2-12*x = 0
x^2-12*x = 0
DELTA = (-12)^2-(0*1*4)
DELTA = 144
DELTA > 0
x = (144^(1/2)+12)/(1*2) or x = (12-144^(1/2))/(1*2)
x = 12 or x = 0
x in { 0, 12 }
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