`a) |x − 3| − 16 = −4`
`⇒|x − 3| = −4+ 16`
`⇒|x − 3| = 12`
`⇒x-3 =12` hoặc `x-3=-12`
`⇒x=15` hoặc `x=-9`
`b) 26 - |x + 9| = −13`
`⇒ |x + 9| = 26-(−13)`
`⇒ |x + 9| =39`
`⇒x+9=39` hoặc `x+9=-39`
`⇒x=30` hoặc `x=-48`
`c) 5 – ( 10 – x) = 7`
`⇒ 10 – x=5- 7`
`⇒ 10 – x =-2`
`⇒ x=10-(-2)`
`⇒x=12`
`d) 11 + ( 15 –x) = 1`
`⇒ 15 –x= 1-11`
`⇒ 15 –x = -10`
`⇒x=15-(-10)`
`⇒x=25`
`e) 8x – 75 = 5x + 21`
`⇒8x – 5x = 21+75`
`⇒2x=96`
`⇒x=96:2`
`⇒x=48`
`g) 9x + 25 = - ( 2x – 58)`
`⇒9x + 25 = -2x +58`
`⇒9x + 2x = 58-25`
`⇒11x=33`
`⇒x=3`
`h) |x + 3| = 4`
`⇒x+3=4` hoặc `x+3=-4`
`⇒x=1` hoặc `x=-7`
`i) 15 - |2x − 1| = |−8|`
`⇒15 - |2x − 1| = 8`
`⇒ |2x − 1| = 15-8`
`⇒ |2x − 1| = 5`
`⇒2x-1=5` hoặc `2x-1=-5`
`⇒2x=6` hoặc `2x=-4`
`⇒x=3` hoặc `x= -2`