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240=3(45+b)
We move all terms to the left:
240-(3(45+b))=0
We add all the numbers together, and all the variables
-(3(b+45))+240=0
We calculate terms in parentheses: -(3(b+45)), so:We get rid of parentheses
3(b+45)
We multiply parentheses
3b+135
Back to the equation:
-(3b+135)
-3b-135+240=0
We add all the numbers together, and all the variables
-3b+105=0
We move all terms containing b to the left, all other terms to the right
-3b=-105
b=-105/-3
b=+35
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