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4a-11=2a-7
We move all terms to the left:
4a-11-(2a-7)=0
We get rid of parentheses
4a-2a+7-11=0
We add all the numbers together, and all the variables
2a-4=0
We move all terms containing a to the left, all other terms to the right
2a=4
a=4/2
a=2
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