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2n+12=-3-n
We simplify the equation to the form, which is simple to understand
2n+12=-3-n
We move all terms containing n to the left and all other terms to the right.
+2n+1n=-3-12
We simplify left and right side of the equation.
+3n=-15
We divide both sides of the equation by 3 to get n.
n=-5
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