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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We can put both in an equation, when we do, x=6

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