Răspuns :
(((7-3)×5-2+3)÷7+9)÷3=
=((4×5-2+3)÷7+9)÷3=
=((20-2+3)÷7+9)÷3=
=((18+3)÷7+9)÷3=
=(21÷7+9)÷3=
=(3+9)÷3=
=12÷3=
=4
=((4×5-2+3)÷7+9)÷3=
=((20-2+3)÷7+9)÷3=
=((18+3)÷7+9)÷3=
=(21÷7+9)÷3=
=(3+9)÷3=
=12÷3=
=4