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19=8a+7-6a
We move all terms to the left:
19-(8a+7-6a)=0
We add all the numbers together, and all the variables
-(2a+7)+19=0
We get rid of parentheses
-2a-7+19=0
We add all the numbers together, and all the variables
-2a+12=0
We move all terms containing a to the left, all other terms to the right
-2a=-12
a=-12/-2
a=+6
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