Question

a+b=518            b-193=291               x-y=236          x-173  =346                

Answer 1

b-193=291  => b=291+193=484
a+b=518  => a=518-b=518-484=34
x-173=346  => x=346+173=519
x-y=236  => y=x-236=519-236=283

Answer 2

a+b=518⇒a=518-b
b-193=291⇒b=291+193⇒b=484
a=518-484⇒a=34


iar in cealalta parte faci la fel.cum se afla un factor intr-o operatie matematica.       
:D