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37=4a+9
We move all terms to the left:
37-(4a+9)=0
We get rid of parentheses
-4a-9+37=0
We add all the numbers together, and all the variables
-4a+28=0
We move all terms containing a to the left, all other terms to the right
-4a=-28
a=-28/-4
a=+7
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