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x+1+x+8=3x+1
We move all terms to the left:
x+1+x+8-(3x+1)=0
We add all the numbers together, and all the variables
2x-(3x+1)+9=0
We get rid of parentheses
2x-3x-1+9=0
We add all the numbers together, and all the variables
-1x+8=0
We move all terms containing x to the left, all other terms to the right
-x=-8
x=-8/-1
x=+8
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