a: =>2x=-3/4+1/3=-9/12+4/12=-5/12
=>x=-5/24
b: =>2x=7,3-3,5=3,8
hay x=1,9
`2x - 1/2 = -3/4`
` 2x = -3/4 + 1/2`
` 2x = -5/12`
` x = -5/12 : 2`
` x = -5/12 xx 1/2`
` x = -5/24`
` 7,3 - 2x = 3,5`
` 2x = 7,3 - 3,5`
` 2x = 3,8`
` x = 3,8 : 2`
` x = 1,9`