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10=-2n+1
We move all terms to the left:
10-(-2n+1)=0
We get rid of parentheses
2n-1+10=0
We add all the numbers together, and all the variables
2n+9=0
We move all terms containing n to the left, all other terms to the right
2n=-9
n=-9/2
n=-4+1/2
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