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-21-9n+2n=10n-4
We simplify the equation to the form, which is simple to understand
-21-9n+2n=10n-4
We move all terms containing n to the left and all other terms to the right.
-9n+2n-10n=-4+21
We simplify left and right side of the equation.
-17n=+17
We divide both sides of the equation by -17 to get n.
n=-1
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