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2a=3a+15
We move all terms to the left:
2a-(3a+15)=0
We get rid of parentheses
2a-3a-15=0
We add all the numbers together, and all the variables
-1a-15=0
We move all terms containing a to the left, all other terms to the right
-a=15
a=15/-1
a=-15
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