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(2n)+(3n-5)=90
We move all terms to the left:
(2n)+(3n-5)-(90)=0
We get rid of parentheses
2n+3n-5-90=0
We add all the numbers together, and all the variables
5n-95=0
We move all terms containing n to the left, all other terms to the right
5n=95
n=95/5
n=19
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