2x+1+x-1=18

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Solution for 2x+1+x-1=18 equation: 



2x+1+x-1=18

We move all terms to the left:

2x+1+x-1-(18)=0

We add all the numbers together, and all the variables

3x-18=0

We move all terms containing x to the left, all other terms to the right

3x=18

x=18/3

x=6

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