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-121=9+10n
We simplify the equation to the form, which is simple to understand
-121=9+10n
We move all terms containing n to the left and all other terms to the right.
-10n=+9+121
We simplify left and right side of the equation.
-10n=+130
We divide both sides of the equation by -010 to get n.
n=-13
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