5x^2+2=0
(x-1)^2=x^2-2x
2x+9=2x-11
2x-5=3x+7
7x-14=0
(x+2)^2=x^2+4x+4
3/x=0
2(x+1)=2x+2
x^2-9=(x+3)(x-3)
10x^2=0
3x/x=3
2x/3=0
x^2-1=0
