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89=6a+11
We move all terms to the left:
89-(6a+11)=0
We get rid of parentheses
-6a-11+89=0
We add all the numbers together, and all the variables
-6a+78=0
We move all terms containing a to the left, all other terms to the right
-6a=-78
a=-78/-6
a=+13
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