100=(-20)(n-1)

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Solution for 100=(-20)(n-1) equation: 



100=(-20)(n-1)

We move all terms to the left:

100-((-20)(n-1))=0

We multiply parentheses ..

-((-20n+20))+100=0



We calculate terms in parentheses: -((-20n+20)), so:

(-20n+20)

We get rid of parentheses

-20n+20

Back to the equation:

-(-20n+20)



We get rid of parentheses

20n-20+100=0

We add all the numbers together, and all the variables

20n+80=0

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

20n=-80

n=-80/20

n=-4

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