(4n-15)+3n=90

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Solution for (4n-15)+3n=90 equation: 



(4n-15)+3n=90

We move all terms to the left:

(4n-15)+3n-(90)=0

We add all the numbers together, and all the variables

3n+(4n-15)-90=0

We get rid of parentheses

3n+4n-15-90=0

We add all the numbers together, and all the variables

7n-105=0

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

7n=105

n=105/7

n=15

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