(630+670)-x=410+120
630 + 670 – x = 410 + 120
– x = 120 + 410 – 670 – 630
-x = -770
x = 770
a-(47+33)=310+120
a – 47 – 33 = 310 + 120
a = 120 + 310 + 33 + 47
a = 510
(630+670)-x=410+120
630 + 670 – x = 410 + 120
– x = 120 + 410 – 670 – 630
-x = -770
x = 770
a-(47+33)=310+120
a – 47 – 33 = 310 + 120
a = 120 + 310 + 33 + 47
a = 510