Tìm `x` biết : `a). 4(18-5x)-12(3x-7)=15(2x-16)-6(x+14)` `b). 5(3x+5)-4(2x-3)=5x+3(2x+12)+1` `c). 2(5x-8)-3(4x-5)=4(3x-4)+11` `d). 5x-3{4x-2[4x-3(5x-2)]}=182`

` a)4(18-5x)-12(3x-7)=15(2x-16)-6(x+14)`

`=>72-20x-36x+84=30x-240-6x-84`

`=>-56x+156=24x-324`

`=>-56x+156-24x+324=0`

`=>-80x+480=0`

`=>-80x=-480`

`=>x=6`

`b)5(3x+5)-4(2x-3)=5x+3(2x+12)+1`

`=>15x+25-8x+12=5x+6x+36+1`

`=>7x+37=11x+37`

`=>7x+37-11x-37=0`

`=>-4x=0`

`=>x=0`

`c)2(5x-8)-3(4x-5)=4(3x-4)+11`

`=>10x-16-12x+15=12x-16+11`

`=>-2x-1=12x-5`

`=>-2x-1-12x+5=0`

`=>-14x+4=0`

`=>-14x=-4`

`=>x=2/7`

`d)5x-3{4x-2[4x-3(5x-2)]}=182`

`=>5x-3[4x-2(4x-15x+6)]=182`

`=>5x-3[4x-2(-11x+6)]=182`

`=>5x-3(4x+22x-12)=182`

`=>5x-3(26x-12)=182`

`=>5x-78x+36=182`

`=>-73x=182-36`

`=>-73x=146`

`=>x=-2`