`a) (3x – 6) + 3 = 3^2⇔3x-6+3=9⇔3x=12⇔x=4`
`b) (3x – 6) - 3 = 3^2⇔3x-6-3=9⇔3x=18⇔x=6`
`c) (3x – 6) . 3 = 3^2⇔9x-18=9⇔x=3`
`d) (3x – 6) : 3 = 3^2⇔x-2=9⇔x=11`
`e) (3x -24).73 = 2.7^4⇔657x-1752=4802⇔x=6554/657`
`f) |x| = |-7|⇔|x|=7⇒x=7` hoặc `x=-7`
`g) |x+1| = 2⇔x+1=2` hoặc `x+1=-2⇔x=1` hoặc `x=-3`
`h) |x+1| = 3 ⇒x+1=3` hoặc `x+1=-3` mà `x+1<0⇒x+1=-3⇔x=-4`
`i) x +|-2| = 0⇔x+2=0⇔x=-2`
`j) 4.(3x – 4) – 2 = 18⇔12x-16-2=18⇔12x=36⇔x=3`