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6(6+a)=39
We move all terms to the left:
6(6+a)-(39)=0
We add all the numbers together, and all the variables
6(a+6)-39=0
We multiply parentheses
6a+36-39=0
We add all the numbers together, and all the variables
6a-3=0
We move all terms containing a to the left, all other terms to the right
6a=3
a=3/6
a=1/2
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