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10a+28=a+64
We move all terms to the left:
10a+28-(a+64)=0
We get rid of parentheses
10a-a-64+28=0
We add all the numbers together, and all the variables
9a-36=0
We move all terms containing a to the left, all other terms to the right
9a=36
a=36/9
a=4
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