`x/2 - 1/3 = x/6`
`<=>3x-2=x`
`<=>-2x=-2`
`<=>x=1`
`x+2/(x-2 )- 1/x = -2/(2x - x^2)`
`<=>4x^3-x^4-5x^2+2x=0`
`<=>x(4x^2-x^3-5x+2)=0`
`<=>x={0,1,2}`
`(x+ 3) ( x^2 - 6x + 4 ) - ( x+3 ) x^2= 0`
`<=>(x+3)(x^2-6x+4)-x^2(x+3)=0`
`<=>x≈0,7` hoặc `x=-3`
`|x+3| = 2x + 3`
`<=>x-1=2x+3 ` hoặc `<=>1-x=2x+3`
`<=>-x=4` hoặc `<=>x=-2/3`