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3+2n=n+7
We simplify the equation to the form, which is simple to understand
3+2n=n+7
We move all terms containing n to the left and all other terms to the right.
+2n-1n=+7-3
We simplify left and right side of the equation.
+1n=+4
We divide both sides of the equation by 1 to get n.
n=4
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