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To solve for m, we can isolate the variable by performing inverse operations.
First, add 9 to both sides of the equation:
2m - 9 + 9 = 21 + 9
This simplifies to:
2m = 30
Next, divide both sides of the equation by 2 to solve for m:
2m/2 = 30/2
This simplifies to:
m = 15
Therefore, the solution for m is 15.