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6a+3+7a=11-23
We move all terms to the left:
6a+3+7a-(11-23)=0
We add all the numbers together, and all the variables
6a+7a+3-(-12)=0
We add all the numbers together, and all the variables
13a+15=0
We move all terms containing a to the left, all other terms to the right
13a=-15
a=-15/13
a=-1+2/13
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