Bài `1:`
`a)` `x+1/2=3/2`
`x` `=3/2-1/2`
`x` `=1`
`b)` `1/2-x=-9/4`
`x=1/2-(-9/4)`
`x=11/4`
`c)` `3x.(-1/2)=-7/6`
`3x` `=-7/6:(-1/2)`
`3x` `=7/3`
`x` `=7/3 : 3 `
`x` `=7/9`
`d)` `2/3 + 5/2 : x = 3/4`
`5/2 : x = 3/4 - 2/3`
`5/2 : x = 1/12`
`x=5/2 : 1/12`
`x=30`
`e)` `-7/12 - 5/12 . (3/5 + x )=3/4`
`5/12 . (3/5 + x )=-7/12 - 3/4`
`5/12 . (3/5 + x )=-4/3`
`3/5 + x =-4/3 : 5/12`
`3/5 + x =-16/5`
`x=-16/5 - 3/5`
`x=-19/5`