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a+6+9a=42+5a-11
We move all terms to the left:
a+6+9a-(42+5a-11)=0
We add all the numbers together, and all the variables
a+9a-(5a+31)+6=0
We add all the numbers together, and all the variables
10a-(5a+31)+6=0
We get rid of parentheses
10a-5a-31+6=0
We add all the numbers together, and all the variables
5a-25=0
We move all terms containing a to the left, all other terms to the right
5a=25
a=25/5
a=5
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