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3-11a=a-13
We move all terms to the left:
3-11a-(a-13)=0
We get rid of parentheses
-11a-a+13+3=0
We add all the numbers together, and all the variables
-12a+16=0
We move all terms containing a to the left, all other terms to the right
-12a=-16
a=-16/-12
a=1+1/3
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