20n+22n-12n=90

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Solution for 20n+22n-12n=90 equation: 



20n+22n-12n=90

We move all terms to the left:

20n+22n-12n-(90)=0

We add all the numbers together, and all the variables

30n-90=0

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

30n=90

n=90/30

n=3

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