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3n+6+7n=42-2n
We simplify the equation to the form, which is simple to understand
3n+6+7n=42-2n
We move all terms containing n to the left and all other terms to the right.
+3n+7n+2n=+42-6
We simplify left and right side of the equation.
+12n=+36
We divide both sides of the equation by 12 to get n.
n=3
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