(n-1)*2=20

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Solution for (n-1)*2=20 equation: 



(n-1)*2=20

We move all terms to the left:

(n-1)*2-(20)=0

We multiply parentheses

2n-2-20=0

We add all the numbers together, and all the variables

2n-22=0

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

2n=22

n=22/2

n=11

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