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-n+5+2-n=0
We simplify the equation to the form, which is simple to understand
-n+5+2-n=0
We move all terms containing n to the left and all other terms to the right.
-1n-1n=0-5-2
We simplify left and right side of the equation.
-2n=-7
We divide both sides of the equation by -2 to get n.
n=3.5
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