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10a=5a+15
We move all terms to the left:
10a-(5a+15)=0
We get rid of parentheses
10a-5a-15=0
We add all the numbers together, and all the variables
5a-15=0
We move all terms containing a to the left, all other terms to the right
5a=15
a=15/5
a=3
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