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