Simplify the following mathematical expression:
$18 + 9 - 15 + 3$

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Solution

BODMAS:
$18 + 9 - 15 + 3$
$= 18 + 9 - 15 + 3$ (Addition: $18 + 9 + 3$ )
$= 30 - 15$ (Subtraction: $30 - 15$ )
$= 15$

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