`c)2/5(x-1/2)-50% . (2x+4) = -2 1/3`
`=>2/5(x-1/2)-50% . (2x+4)= - (2.3+1)/3`
`=>2/5(x-1/2)-50% . (2x+4)= - 7/3`
`=>2/5x - 2/5 . 1/2 - 50/100(2x+4) = - 7/3`
`=>2/5x-1/5 - 1/2(2x+4)= - 7/3`
`=>2/5x-1/5 - 1/2.2x + 1/2 . 4 =-7/3`
`=>2/5x-1/5 - 1x+ 4/2 = -7/3`
`=>2/5x-1/5-1x+2=-7/3`
`=>(2/5x-1x)-(1/5+2)=-7/3`
`=>-3/5x - 11/5=-7/3`
`=>-3/5x=-7/3+11/5`
`=>-3/5x=- 2/15`
`=>x= -2/15: -3/5`
`=>x=2/9`
Vậy `x=2/9`
