Answer:
4 balloons
Explanation:
According to the problem, the data given are as follows,
Equation given = x + 8 = 12
Here X is showing the number of balloons which Dylan more needs to decorate.
So, by solving the equation, we get
X + 8 = 12
( by taking 8 to RHS )
X = 12 - 8
X = 4
Hence, Dylan need 4 more balloons to decorate for a party.