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n-28=-7(3n+4)
We move all terms to the left:
n-28-(-7(3n+4))=0
We calculate terms in parentheses: -(-7(3n+4)), so:We get rid of parentheses
-7(3n+4)
We multiply parentheses
-21n-28
Back to the equation:
-(-21n-28)
n+21n+28-28=0
We add all the numbers together, and all the variables
22n=0
n=0/22
n=0
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