840=150+0.12(n-1250)

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Solution for 840=150+0.12(n-1250) equation: 



840=150+0.12(n-1250)

We move all terms to the left:

840-(150+0.12(n-1250))=0



We calculate terms in parentheses: -(150+0.12(n-1250)), so:

150+0.12(n-1250)

determiningTheFunctionDomain
0.12(n-1250)+150

We multiply parentheses

0.12n-150+150

We add all the numbers together, and all the variables

0.12n

Back to the equation:

-(0.12n)



We add all the numbers together, and all the variables

-(+0.12n)+840=0

We get rid of parentheses

-0.12n+840=0

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

-0.12n=-840

n=-840/-0.12

n=+7000

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