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0=5n+(20+9n)
We simplify the equation to the form, which is simple to understand
0=5n+(20+9n)
Remove unnecessary parentheses
0=+5n+20+9n
We move all terms containing n to the left and all other terms to the right.
-5n-9n=+20-0
We simplify left and right side of the equation.
-14n=+20
We divide both sides of the equation by -14 to get n.
n=-1.42857142857
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