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(x+3)+3x=47
We move all terms to the left:
(x+3)+3x-(47)=0
We add all the numbers together, and all the variables
3x+(x+3)-47=0
We get rid of parentheses
3x+x+3-47=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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