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180=2b+3b
We move all terms to the left:
180-(2b+3b)=0
We add all the numbers together, and all the variables
-(+5b)+180=0
We get rid of parentheses
-5b+180=0
We move all terms containing b to the left, all other terms to the right
-5b=-180
b=-180/-5
b=+36
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