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15a-5=a+9
We move all terms to the left:
15a-5-(a+9)=0
We get rid of parentheses
15a-a-9-5=0
We add all the numbers together, and all the variables
14a-14=0
We move all terms containing a to the left, all other terms to the right
14a=14
a=14/14
a=1
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