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(n+n)+3=90
We move all terms to the left:
(n+n)+3-(90)=0
We add all the numbers together, and all the variables
(+2n)+3-90=0
We add all the numbers together, and all the variables
(+2n)-87=0
We get rid of parentheses
2n-87=0
We move all terms containing n to the left, all other terms to the right
2n=87
n=87/2
n=43+1/2
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