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(2x+4)+x+(2x+4)+x=7x
We move all terms to the left:
(2x+4)+x+(2x+4)+x-(7x)=0
We add all the numbers together, and all the variables
-5x+(2x+4)+(2x+4)=0
We get rid of parentheses
-5x+2x+2x+4+4=0
We add all the numbers together, and all the variables
-1x+8=0
We move all terms containing x to the left, all other terms to the right
-x=-8
x=-8/-1
x=+8
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