7n+9n=4(1+9n)+4(12-6n)

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Solution for 7n+9n=4(1+9n)+4(12-6n) equation: 



7n+9n=4(1+9n)+4(12-6n)

We move all terms to the left:

7n+9n-(4(1+9n)+4(12-6n))=0

We add all the numbers together, and all the variables

7n+9n-(4(9n+1)+4(-6n+12))=0

We add all the numbers together, and all the variables

16n-(4(9n+1)+4(-6n+12))=0



We calculate terms in parentheses: -(4(9n+1)+4(-6n+12)), so:

4(9n+1)+4(-6n+12)

We multiply parentheses

36n-24n+4+48

We add all the numbers together, and all the variables

12n+52

Back to the equation:

-(12n+52)



We get rid of parentheses

16n-12n-52=0

We add all the numbers together, and all the variables

4n-52=0

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

4n=52

n=52/4

n=13

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