x-1+2x=20

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Solution for x-1+2x=20 equation: 



x-1+2x=20

We move all terms to the left:

x-1+2x-(20)=0

We add all the numbers together, and all the variables

3x-21=0

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

3x=21

x=21/3

x=7

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