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+9=7B-57
We move all terms to the left:
+9-(7B-57)=0
We get rid of parentheses
-7B+57+9=0
We add all the numbers together, and all the variables
-7B+66=0
We move all terms containing B to the left, all other terms to the right
-7B=-66
B=-66/-7
B=9+3/7
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