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3a+9=5a-11
We move all terms to the left:
3a+9-(5a-11)=0
We get rid of parentheses
3a-5a+11+9=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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