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12=1+2n+5
We simplify the equation to the form, which is simple to understand
12=1+2n+5
We move all terms containing n to the left and all other terms to the right.
-2n=+1+5-12
We simplify left and right side of the equation.
-2n=-6
We divide both sides of the equation by -02 to get n.
n=3
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