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7a-7=4a+11
We move all terms to the left:
7a-7-(4a+11)=0
We get rid of parentheses
7a-4a-11-7=0
We add all the numbers together, and all the variables
3a-18=0
We move all terms containing a to the left, all other terms to the right
3a=18
a=18/3
a=6
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