To solve for x, we can start by isolating the variable. Subtracted 5 from both sides, we get rid of the 5 on the left side:
2x + 5 - 5 = 21 - 5
2x = 16
Then, divide by 2 on both sides to solve for x:
2x/2 = 16/2
x = 8
Therefore, the solution to the equation 2x + 5 = 21 is x = 8.
2x + 5 =21
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