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a-13a=19a+6-7a
We move all terms to the left:
a-13a-(19a+6-7a)=0
We add all the numbers together, and all the variables
a-13a-(12a+6)=0
We add all the numbers together, and all the variables
-12a-(12a+6)=0
We get rid of parentheses
-12a-12a-6=0
We add all the numbers together, and all the variables
-24a-6=0
We move all terms containing a to the left, all other terms to the right
-24a=6
a=6/-24
a=-1/4
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