1)  3x^2-12=0
2)  2x^2+6x=0
3)  1,8x^2=0
4)  x^2+9=0
5)  7x^2-14=0
6)  x^2-3x=0
7)  (x-2)^2=3x-8
8  (x-1)^2=29-5x
9)  (x+3)^2=-(x-1)^2
10) 5(x=2)^2=-6x-44
11) (-x-1)(x-4)=x(4x-11)
12) 5(x-2)=(3x+2)(x-2)

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