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30+n=2(10+n)
We simplify the equation to the form, which is simple to understand
30+n=2(10+n)
Reorder the terms in parentheses
30+n=+(+20+2n)
Remove unnecessary parentheses
+30+n=+20+2n
We move all terms containing n to the left and all other terms to the right.
+1n-2n=+20-30
We simplify left and right side of the equation.
-1n=-10
We divide both sides of the equation by -1 to get n.
n=10
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