40=4-9n

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Solution for 40=4-9n equation: 



40=4-9n

We move all terms to the left:

40-(4-9n)=0

We add all the numbers together, and all the variables

-(-9n+4)+40=0

We get rid of parentheses

9n-4+40=0

We add all the numbers together, and all the variables

9n+36=0

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

9n=-36

n=-36/9

n=-4

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