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-74=7(n-1)+5(n+1)
We move all terms to the left:
-74-(7(n-1)+5(n+1))=0
We calculate terms in parentheses: -(7(n-1)+5(n+1)), so:We get rid of parentheses
7(n-1)+5(n+1)
We multiply parentheses
7n+5n-7+5
We add all the numbers together, and all the variables
12n-2
Back to the equation:
-(12n-2)
-12n+2-74=0
We add all the numbers together, and all the variables
-12n-72=0
We move all terms containing n to the left, all other terms to the right
-12n=72
n=72/-12
n=-6
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