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X+3(3X+1)=13
We move all terms to the left:
X+3(3X+1)-(13)=0
We multiply parentheses
X+9X+3-13=0
We add all the numbers together, and all the variables
10X-10=0
We move all terms containing X to the left, all other terms to the right
10X=10
X=10/10
X=1
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