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75-3b=39-b
We move all terms to the left:
75-3b-(39-b)=0
We add all the numbers together, and all the variables
-3b-(-1b+39)+75=0
We get rid of parentheses
-3b+1b-39+75=0
We add all the numbers together, and all the variables
-2b+36=0
We move all terms containing b to the left, all other terms to the right
-2b=-36
b=-36/-2
b=+18
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