42+7n=3n+90

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Solution for 42+7n=3n+90 equation: 



42+7n=3n+90

We move all terms to the left:

42+7n-(3n+90)=0

We get rid of parentheses

7n-3n-90+42=0

We add all the numbers together, and all the variables

4n-48=0

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

4n=48

n=48/4

n=12

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