To solve the equation, we need to first isolate the variable x. We can do this by subtracting -21 from both sides and then dividing by 4.
-9 + 21 = x / 4
12 = x / 4
To solve for x, we can multiply both sides of the equation by 4.
12 * 4 = x
48 = x
Therefore, x is equal to 48.
-9 = -21 + x
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