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56=9a-34
We move all terms to the left:
56-(9a-34)=0
We get rid of parentheses
-9a+34+56=0
We add all the numbers together, and all the variables
-9a+90=0
We move all terms containing a to the left, all other terms to the right
-9a=-90
a=-90/-9
a=+10
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