Answer:
Step-by-step explanation:
56-45÷5[90÷3{4-(25-31)}]
56-45÷5[90÷3{4-(-6)}]
56-45÷5[90÷3x10}]
56-45÷5[90÷30}]
56-45÷5x3
56-45÷15
56-3
53
One this the answer
