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(4x+15)+(4x-10)+(5x+5)+(4x-10)+4x+15)=540
We move all terms to the left:
(4x+15)+(4x-10)+(5x+5)+(4x-10)+4x+15)-(540)=0
We add all the numbers together, and all the variables
4x+(4x+15)+(4x-10)+(5x+5)+(4x-10)=0
We get rid of parentheses
4x+4x+4x+5x+4x+15-10+5-10=0
We add all the numbers together, and all the variables
21x=0
x=0/21
x=0
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