Question

tìm x bt

Answer 1

`x-17 = (-12)-7`

`x-17=-12-7`

`x-17=-19`

`x=-19+17`

`x=-2`

_________________________

`x-(-19)-(-11)=0`

`x+19+11=0`

`x+30=0`

`x=0-30`

`x=-30`

__________________________

`9-25=(7-x)-(25+7)`

`-16=(7-x)-32`

`(7-x)-32=-16`

`7-x=-16+32`

`7-x=16`

`x=7-16`

`x=-9`

Answer 2

a: =>x-17=-19

hay x=-2

b: =>x+19+11=0

hay x=-30

c: =>7-x-32=-16

=>x+25=16

hay x=-9