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-89=-5n-(-7+7n)
We simplify the equation to the form, which is simple to understand
-89=-5n-(-7+7n)
Remove unnecessary parentheses
-89=-5n+7-7n
We move all terms containing n to the left and all other terms to the right.
+5n+7n=+7+89
We simplify left and right side of the equation.
+12n=+96
We divide both sides of the equation by 12 to get n.
n=8
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