b÷6×6÷3×3=8+8+9÷9+13

Răspuns :

b:6×6:3×3=8+8+9:9+13
b:6×6:3×3=30
b:6×6:3=30:3=10
b:6×6=10×3=30
b:6=30:6=5
b=6×5=30