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-4n+5(7n-5)=223
We move all terms to the left:
-4n+5(7n-5)-(223)=0
We multiply parentheses
-4n+35n-25-223=0
We add all the numbers together, and all the variables
31n-248=0
We move all terms containing n to the left, all other terms to the right
31n=248
n=248/31
n=8
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