4 x - 8 = 10 6 x + 3 = 30 5 x = 66 -6 x = 18 7 + 3 x = 28 6 - 15 x = - 24
2 câu trả lời
`a) 4x-8= 10`
`=> 4x= 10+8`
`=> 4x= 18`
`=> x= 9/2`
`b) 6x+3= 30`
`=> 6x= 30-3`
`=> 6x= 27`
`=> x= 27:6`
`=> x= 9/2`
`c) 5x= 66`
`=> x= 66:5`
`=> x= 66/5`
`d) -6x= 18`
`=> x= 18:(-6)`
`=> x= -3`
`e) 7+3x= 28`
`=> 3x= 28-7`
`=> 3x= 21`
`=> x= 21:3`
`=> x= 7`
`f) 6-15x= -24`
`=> 15x= 6-(-24)`
`=> 15x= 30`
`=> x= 30:15`
`=> x= 2`