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4n+1=90+31
We move all terms to the left:
4n+1-(90+31)=0
We add all the numbers together, and all the variables
4n+1-121=0
We add all the numbers together, and all the variables
4n-120=0
We move all terms containing n to the left, all other terms to the right
4n=120
n=120/4
n=30
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