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39=7(5)+b
We move all terms to the left:
39-(7(5)+b)=0
We add all the numbers together, and all the variables
-(b+75)+39=0
We get rid of parentheses
-b-75+39=0
We add all the numbers together, and all the variables
-1b-36=0
We move all terms containing b to the left, all other terms to the right
-b=36
b=36/-1
b=-36
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