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180=138+3b
We move all terms to the left:
180-(138+3b)=0
We add all the numbers together, and all the variables
-(3b+138)+180=0
We get rid of parentheses
-3b-138+180=0
We add all the numbers together, and all the variables
-3b+42=0
We move all terms containing b to the left, all other terms to the right
-3b=-42
b=-42/-3
b=+14
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