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5+6a=15+4a
We move all terms to the left:
5+6a-(15+4a)=0
We add all the numbers together, and all the variables
6a-(4a+15)+5=0
We get rid of parentheses
6a-4a-15+5=0
We add all the numbers together, and all the variables
2a-10=0
We move all terms containing a to the left, all other terms to the right
2a=10
a=10/2
a=5
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