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-6a+13=-4a
We move all terms to the left:
-6a+13-(-4a)=0
We get rid of parentheses
-6a+4a+13=0
We add all the numbers together, and all the variables
-2a+13=0
We move all terms containing a to the left, all other terms to the right
-2a=-13
a=-13/-2
a=6+1/2
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