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-27=-3(n+7)+3(n-2)
We move all terms to the left:
-27-(-3(n+7)+3(n-2))=0
We calculate terms in parentheses: -(-3(n+7)+3(n-2)), so:We add all the numbers together, and all the variables
-3(n+7)+3(n-2)
We multiply parentheses
-3n+3n-21-6
We add all the numbers together, and all the variables
-27
Back to the equation:
-(-27)
=0
n=0/1
n=0
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