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(2x+4)+x+(x+7)=55
We move all terms to the left:
(2x+4)+x+(x+7)-(55)=0
We add all the numbers together, and all the variables
x+(2x+4)+(x+7)-55=0
We get rid of parentheses
x+2x+x+4+7-55=0
We add all the numbers together, and all the variables
4x-44=0
We move all terms containing x to the left, all other terms to the right
4x=44
x=44/4
x=11
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