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2(a+9)=37
We move all terms to the left:
2(a+9)-(37)=0
We multiply parentheses
2a+18-37=0
We add all the numbers together, and all the variables
2a-19=0
We move all terms containing a to the left, all other terms to the right
2a=19
a=19/2
a=9+1/2
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