4n-40=7(2n+5n)

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Solution for 4n-40=7(2n+5n) equation: 



4n-40=7(2n+5n)

We move all terms to the left:

4n-40-(7(2n+5n))=0

We add all the numbers together, and all the variables

4n-(7(+7n))-40=0



We calculate terms in parentheses: -(7(+7n)), so:

7(+7n)

We multiply parentheses

49n

Back to the equation:

-(49n)



We add all the numbers together, and all the variables

-45n-40=0

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

-45n=40

n=40/-45

n=-8/9

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