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