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3(a+7)-7=9
We move all terms to the left:
3(a+7)-7-(9)=0
We add all the numbers together, and all the variables
3(a+7)-16=0
We multiply parentheses
3a+21-16=0
We add all the numbers together, and all the variables
3a+5=0
We move all terms containing a to the left, all other terms to the right
3a=-5
a=-5/3
a=-1+2/3
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