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14*x^2-((7/4)*x) = 0
14*x^2+(-7/4)*x = 0
14*x^2-7/4*x = 0
DELTA = (-7/4)^2-(0*4*14)
DELTA = 49/16
DELTA > 0
x = ((49/16)^(1/2)+7/4)/(2*14) or x = (7/4-(49/16)^(1/2))/(2*14)
x = 1/8 or x = 0
x in { 0, 1/8 }
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