21+(n-1)(-3)=0

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Solution for 21+(n-1)(-3)=0 equation: 



21+(n-1)(-3)=0

We multiply parentheses ..

(-3n+3)+21=0

We get rid of parentheses

-3n+3+21=0

We add all the numbers together, and all the variables

-3n+24=0

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

-3n=-24

n=-24/-3

n=+8

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