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x in (-oo:+oo)
x^2-((224/16)*x) = 0
x^2-14*x = 0
x^2-14*x = 0
DELTA = (-14)^2-(0*1*4)
DELTA = 196
DELTA > 0
x = (196^(1/2)+14)/(1*2) or x = (14-196^(1/2))/(1*2)
x = 14 or x = 0
x in { 0, 14 }
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