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4a=6a-20
We move all terms to the left:
4a-(6a-20)=0
We get rid of parentheses
4a-6a+20=0
We add all the numbers together, and all the variables
-2a+20=0
We move all terms containing a to the left, all other terms to the right
-2a=-20
a=-20/-2
a=+10
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