2x + 15 = 29
Subtract 15 from both sides : 2x = 14
Divide by 2 : x = 7
2(7) + 15 = 29
14 + 15 = 29
15 + 2x = 29
Subtract 15
2x = 14
Divide by 2
x = 7
The number is 7.
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