2.x-1=20

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Solution for 2.x-1=20 equation: 



2.x-1=20

We move all terms to the left:

2.x-1-(20)=0

We add all the numbers together, and all the variables

2.x-21=0

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

2.x=21

x=21/2.

x=10+1/2.

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