To solve this equation, we can start by simplifying the expression on the right side of the equation:
-9 = -21 + x / 4
Next, we can isolate the variable x by adding 21 to both sides of the equation:
-9 + 21 = x / 4
12 = x / 4
To solve for x, we can multiply both sides of the equation by 4:
4 * 12 = x
48 = x
Therefore, the solution to the equation is x = 48.
-9 = -21 + x
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