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408=-4(10n-12)
We move all terms to the left:
408-(-4(10n-12))=0
We calculate terms in parentheses: -(-4(10n-12)), so:We get rid of parentheses
-4(10n-12)
We multiply parentheses
-40n+48
Back to the equation:
-(-40n+48)
40n-48+408=0
We add all the numbers together, and all the variables
40n+360=0
We move all terms containing n to the left, all other terms to the right
40n=-360
n=-360/40
n=-9
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