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5(a+9)=39
We move all terms to the left:
5(a+9)-(39)=0
We multiply parentheses
5a+45-39=0
We add all the numbers together, and all the variables
5a+6=0
We move all terms containing a to the left, all other terms to the right
5a=-6
a=-6/5
a=-1+1/5
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