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x+2x+(4x+1)=15
We move all terms to the left:
x+2x+(4x+1)-(15)=0
We add all the numbers together, and all the variables
3x+(4x+1)-15=0
We get rid of parentheses
3x+4x+1-15=0
We add all the numbers together, and all the variables
7x-14=0
We move all terms containing x to the left, all other terms to the right
7x=14
x=14/7
x=2
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