Răspuns :
fie nr=X
(X/9x6):3=10
simplificam 6 si 9 prin 3
(X/3x2)=10x3
2X/3=30
2X=30x3
2X=90
X=90:2
X=45
(X/9x6):3=10
simplificam 6 si 9 prin 3
(X/3x2)=10x3
2X/3=30
2X=30x3
2X=90
X=90:2
X=45