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-3(1+7a)=37-9
We move all terms to the left:
-3(1+7a)-(37-9)=0
We add all the numbers together, and all the variables
-3(7a+1)-28=0
We multiply parentheses
-21a-3-28=0
We add all the numbers together, and all the variables
-21a-31=0
We move all terms containing a to the left, all other terms to the right
-21a=31
a=31/-21
a=-1+10/21
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