Answer :
The value of x is 18.
6 + 9 + x = 30 + 21
x = 30 + 21 - 6 - 9
x = 18
Here is a more detailed explanation of the solution:
We can solve for x by isolating x on the left-hand side of the equation.
First, we combine the terms on the right-hand side of the equation.
Then, we subtract 6 and 9 from both sides of the equation.
This gives us x = 18.
Therefore, the value of x is 18.
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