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-12=b+(-51)
We move all terms to the left:
-12-(b+(-51))=0
We calculate terms in parentheses: -(b+(-51)), so:We get rid of parentheses
b+(-51)
We add all the numbers together, and all the variables
b-51
Back to the equation:
-(b-51)
-b+51-12=0
We add all the numbers together, and all the variables
-1b+39=0
We move all terms containing b to the left, all other terms to the right
-b=-39
b=-39/-1
b=+39
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