tìm x biết
a, (3x+1).(x-3)-x.(3x-14)= 15
b, (x-3)^2= 9-x^2
c, (2x-1/2)^2-(1-2x)^2=2d, 4x^2+4x-3=0 d, 4x^2+4x-3=0
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