Đáp án:
↓↓
Giải thích các bước giải:
`a)`
`2(4x-8)-7(3+x)=|-4|(3-2)`
`8x-16-21-7x=4.1`
`8x-7x-16-21=4`
`x =4+21+16`
`x =41`
`b)`
`8(x-|-7|)-6(x-2)=|-8|.6-50`
`8x-56-6x+12=-2`
`2x-44=2`
`2x=44-2`
`2x=42`
`x=42:2`
`x=21`
`c)`
`-7(5-x)-2(x-10)=15`
`=>-35-7x-2x+20`
`=>-15+x.(7-2)=15.5x=-15`
`=>-15.5x=-30`
`=>x=-30:5`
`=>x=-6`
`d)`
`4(x-1)-3(x-2) = -|-5|`
`=>(x-1)-3(x-2)=-|-5|`
`=>4x-4-3x+6=-5`
`x=(-5)-2`
`x=-7`
`e)`
`-4(x+1) + (89x -3) = 24`
`=>-4x-4+89x-3=24`
`=>85x-7=24`
`=>85x=24+7=31`
`=>x=31/85 .`