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56=-7-9b
We move all terms to the left:
56-(-7-9b)=0
We add all the numbers together, and all the variables
-(-9b-7)+56=0
We get rid of parentheses
9b+7+56=0
We add all the numbers together, and all the variables
9b+63=0
We move all terms containing b to the left, all other terms to the right
9b=-63
b=-63/9
b=-7
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