780=13(c+40)

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Solution for 780=13(c+40) equation: 



780=13(c+40)

We move all terms to the left:

780-(13(c+40))=0



We calculate terms in parentheses: -(13(c+40)), so:

13(c+40)

We multiply parentheses

13c+520

Back to the equation:

-(13c+520)



We get rid of parentheses

-13c-520+780=0

We add all the numbers together, and all the variables

-13c+260=0

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

-13c=-260

c=-260/-13

c=+20

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