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-21-5n=-8(5n+7)
We move all terms to the left:
-21-5n-(-8(5n+7))=0
We calculate terms in parentheses: -(-8(5n+7)), so:We get rid of parentheses
-8(5n+7)
We multiply parentheses
-40n-56
Back to the equation:
-(-40n-56)
-5n+40n+56-21=0
We add all the numbers together, and all the variables
35n+35=0
We move all terms containing n to the left, all other terms to the right
35n=-35
n=-35/35
n=-1
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