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(2x+5)+(x-3)+(3x+1)=39
We move all terms to the left:
(2x+5)+(x-3)+(3x+1)-(39)=0
We get rid of parentheses
2x+x+3x+5-3+1-39=0
We add all the numbers together, and all the variables
6x-36=0
We move all terms containing x to the left, all other terms to the right
6x=36
x=36/6
x=6
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