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4(b+5)=5(b+4)
We move all terms to the left:
4(b+5)-(5(b+4))=0
We multiply parentheses
4b-(5(b+4))+20=0
We calculate terms in parentheses: -(5(b+4)), so:We get rid of parentheses
5(b+4)
We multiply parentheses
5b+20
Back to the equation:
-(5b+20)
4b-5b-20+20=0
We add all the numbers together, and all the variables
-b=0
b=0/-1
b=0
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