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(1/2)*x^2-((1/14)*x)-(13/7) = 0
(1/2)*x^2+(-1/14)*x-13/7 = 0
1/2*x^2-1/14*x-13/7 = 0
DELTA = (-1/14)^2-(-13/7*1/2*4)
DELTA = 729/196
DELTA > 0
x = ((729/196)^(1/2)+1/14)/(1/2*2) or x = (1/14-(729/196)^(1/2))/(1/2*2)
x = 2 or x = -13/7
x in { -13/7, 2 }
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