Cho ${x_1}$ là giá trị thỏa mãn $x - 876 = \left( { - 1576} \right)$ và ${x_2}$ là giá trị thỏa mãn $x - 983 = \left( { - 163} \right)$. Tính tổng ${x_1} + {x_2}.$

$40$                         

$10$                            

$50$                          

$30$

$- 70$                         

$70$                            

$60$                          

$- 60$

$1818$                         

$1$                            

$0$                          

$- 1818$

$534$                         

$524$   

$- 524$                          

$- 534$

$- 19082$                         

$18092$                            

$- 18092$                          

$- 18093$

$x =  - 452$                         

$x =  - 254$                            

$x = 542$                          

$x = 254$

$678 + \left( { - 4} \right) < 678$                         

$4 + \left( { - 678} \right) >  - 678$                            

$678 + \left( { - 4} \right) = 678$                            

$4 + \left( { - 678} \right) =  - 674$