Answer:
7
Step-by-step explanation:
Let x stand for the unknown number
(4+5)+3=(2+3)+x
First, solve the numbers in paratheses,
(4+5)+3=(2+3)+
9+3=5+x
Then combine like terms
12=5+x
Finally, subtract 5 from both sides
12-5=5-5+x
7=x, therefore 7 makes the statement true.
