78=(n-1)+4(n-1)+8(n-1)

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Solution for 78=(n-1)+4(n-1)+8(n-1) equation: 



78=(n-1)+4(n-1)+8(n-1)

We move all terms to the left:

78-((n-1)+4(n-1)+8(n-1))=0



We calculate terms in parentheses: -((n-1)+4(n-1)+8(n-1)), so:

(n-1)+4(n-1)+8(n-1)

We multiply parentheses

(n-1)+4n+8n-4-8

We get rid of parentheses

n+4n+8n-1-4-8

We add all the numbers together, and all the variables

13n-13

Back to the equation:

-(13n-13)



We get rid of parentheses

-13n+13+78=0

We add all the numbers together, and all the variables

-13n+91=0

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

-13n=-91

n=-91/-13

n=+7

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