To solve this equation, isolate the variable x by performing inverse operations.
1. Subtract 5 from both sides: 2x + 5 - 5 = 21 - 5
2. Simplify: 2x = 16
3. Divide both sides by 2: 2x/2 = 16/2
4. Simplify: x = 8
Therefore, the solution to the equation 2x + 5 = 21 is x = 8.
2x + 5 = 21
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