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4(x+4)=5(x+5)
We move all terms to the left:
4(x+4)-(5(x+5))=0
We multiply parentheses
4x-(5(x+5))+16=0
We calculate terms in parentheses: -(5(x+5)), so:We get rid of parentheses
5(x+5)
We multiply parentheses
5x+25
Back to the equation:
-(5x+25)
4x-5x-25+16=0
We add all the numbers together, and all the variables
-1x-9=0
We move all terms containing x to the left, all other terms to the right
-x=9
x=9/-1
x=-9
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