Hello, there!
88 = 4a + x
Rewrite the equation as 4a+x=88
4a+x=88
Since 4a does not contain the variable to solve for, move it to the right side of the equation by subtracting 4a from both sides.
4a + x = 88
-4a -4a
Therefore, x = 88 - 4a
Our answer is x = 88 - 4a
We can't simplify this any further, as we have no value of a.
I hope I helped!
Let me know if you need anything else!
~ Zoe