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