20=18+n-2

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Solution for 20=18+n-2 equation: 



20=18+n-2

We move all terms to the left:

20-(18+n-2)=0

We add all the numbers together, and all the variables

-(n+16)+20=0

We get rid of parentheses

-n-16+20=0

We add all the numbers together, and all the variables

-1n+4=0

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

-n=-4

n=-4/-1

n=+4

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