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(1/4)*x^2+x-35 = 0
1/4*x^2+x-35 = 0
DELTA = 1^2-(-35*1/4*4)
DELTA = 36
DELTA > 0
x = (36^(1/2)-1)/(1/4*2) or x = (-36^(1/2)-1)/(1/4*2)
x = 10 or x = -14
x in { -14, 10 }
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