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(x+4)+(x+4)+x=50
We move all terms to the left:
(x+4)+(x+4)+x-(50)=0
We add all the numbers together, and all the variables
x+(x+4)+(x+4)-50=0
We get rid of parentheses
x+x+x+4+4-50=0
We add all the numbers together, and all the variables
3x-42=0
We move all terms containing x to the left, all other terms to the right
3x=42
x=42/3
x=14
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