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(3x+1)+x=7
We move all terms to the left:
(3x+1)+x-(7)=0
We add all the numbers together, and all the variables
x+(3x+1)-7=0
We get rid of parentheses
x+3x+1-7=0
We add all the numbers together, and all the variables
4x-6=0
We move all terms containing x to the left, all other terms to the right
4x=6
x=6/4
x=1+1/2
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