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a) x=-1
(3*(-1)-(-1)^2)/2-2=(-3-1)/2-2=(-4)/2-2=(-2)-2=-4
b)x=0
(3*0-0^2)/2-2=0/2-2=0-2=-2
c)x=1
(3*1-1^2)/2-2=2/2-2=1-2=-1