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