a+b+c+d=5460
a-n=1530
b-n= 1390
c-n=1470
d-n=870
Inlocuim termenii din adunare:
n+1530+n+1390+n+1470+n+870=5460
Il luam pe n ca factor comun:
n+(1530+1390+1470+870)=5460
n+5260=5460
n=5460-5260
n=200
a= 1530+200
a= 1730
b=1390+200
b=1590
c=1470+200
c= 1670
d=870+200
d=1070
