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2a-(4+2a)=11+5a
We move all terms to the left:
2a-(4+2a)-(11+5a)=0
We add all the numbers together, and all the variables
2a-(2a+4)-(5a+11)=0
We get rid of parentheses
2a-2a-5a-4-11=0
We add all the numbers together, and all the variables
-5a-15=0
We move all terms containing a to the left, all other terms to the right
-5a=15
a=15/-5
a=-3
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