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11=7a+4a
We move all terms to the left:
11-(7a+4a)=0
We add all the numbers together, and all the variables
-(+11a)+11=0
We get rid of parentheses
-11a+11=0
We move all terms containing a to the left, all other terms to the right
-11a=-11
a=-11/-11
a=1
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