Question

vă rog foarte foqrte mult​

Answer 1

515:5-(6×a+3)=10

103-(6×a+3)=10

6×a+3=103-10

6×a+3=93

6×a=93-3

6×a=90

a=90:6

a=15

Verificare :

515:5-(6×15+3)=10

103-(90+3)=10

103-93=10

10=10