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35 = (2*x)^2+x/2 // - (2*x)^2+x/2
35-(2*x)^2-(x/2) = 0
35-x^2-1/2*x = 0
DELTA = (-1/2)^2-(-1*4*35)
DELTA = 561/4
DELTA > 0
x = ((561/4)^(1/2)+1/2)/(-1*2) or x = (1/2-(561/4)^(1/2))/(-1*2)
x = ((561/4)^(1/2)+1/2)/(-2) or x = (1/2-(561/4)^(1/2))/(-2)
x in { ((561/4)^(1/2)+1/2)/(-2), (1/2-(561/4)^(1/2))/(-2) }
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