4n+3n+2n-7n=18

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Solution for 4n+3n+2n-7n=18 equation: 



4n+3n+2n-7n=18

We move all terms to the left:

4n+3n+2n-7n-(18)=0

We add all the numbers together, and all the variables

2n-18=0

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

2n=18

n=18/2

n=9

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