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20=6+7a
We move all terms to the left:
20-(6+7a)=0
We add all the numbers together, and all the variables
-(7a+6)+20=0
We get rid of parentheses
-7a-6+20=0
We add all the numbers together, and all the variables
-7a+14=0
We move all terms containing a to the left, all other terms to the right
-7a=-14
a=-14/-7
a=+2
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