`a) 4x – 10 = 0`
`⇔4x=10`
`⇔x=5/2`
Vậy `S={5/2}`
`b) 7 – 3x = 9 – x`
`⇔-3x+x=9-7`
`⇔-2x=2`
`⇔x=1`
Vậy `S={1}`
`c) 2x – (3 – 5x) = 4(x +3)`
`⇔2x-3+5x=4x+12`
`⇔2x+5x-4x=12+3`
`⇔3x=15`
`⇔x=5`
Vậy `S={5}`
`d) 5 – (6 – x) = 4(3 – 2x)`
`⇔ 5 – 6 + x) = 12 – 8x)`
`⇔x+8x=12-5 + 6`
`⇔9x=13`
`⇔x=13/9`
Vậy `S={13/9}`
`e) 4(x +3) = -7x +17`
`⇔4x+12=-7x+17`
`⇔4x+7x=17-12`
`⇔11x=5`
`⇔x=5/11`
Vậy `S={5/11}`
`f) 5(x -3) = 2(x -1) + 7`
`⇔5x-15=2x-2+7`
`⇔5x-2x=-2+7+15`
`⇔3x=20`
`⇔x=20/3`
Vậy `S={20/3}`