Question

`19 + x = (-35) + (+29)`

`x - 23 = 79 + (-23) + (-99)`

Answer 1

a: =>x+19=-6

hay x=-25

b: =>x-23=79-23-99

=>x=79-99=-20

Answer 2

a) 19 + x = ( -35 ) + ( +29 )

    19 + x = ( -6 )

            x = 19 - ( -6 )

            x = 25

Vậy x = 25

b) x - 23 = 19 + ( -23 ) + ( -99 )

    x - 23 = ( -103 )

    x        = ( -103 ) + 23

    x        = ( -80 )

Vậy x = ( -80 )