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-19=2a+9-6a
We move all terms to the left:
-19-(2a+9-6a)=0
We add all the numbers together, and all the variables
-(-4a+9)-19=0
We get rid of parentheses
4a-9-19=0
We add all the numbers together, and all the variables
4a-28=0
We move all terms containing a to the left, all other terms to the right
4a=28
a=28/4
a=7
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