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8(5-n)-19+17n-21=0
We simplify the equation to the form, which is simple to understand
8(5-n)-19+17n-21=0
Reorder the terms in parentheses
+(+40-8n)-19+17n-21=0
Remove unnecessary parentheses
+40-8n-19+17n-21=0
We move all terms containing n to the left and all other terms to the right.
-8n+17n=0-40+19+21
We simplify left and right side of the equation.
+9n=0
We divide both sides of the equation by 9 to get n.
n=0
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