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40=-5(2n+2)
We move all terms to the left:
40-(-5(2n+2))=0
We calculate terms in parentheses: -(-5(2n+2)), so:We get rid of parentheses
-5(2n+2)
We multiply parentheses
-10n-10
Back to the equation:
-(-10n-10)
10n+10+40=0
We add all the numbers together, and all the variables
10n+50=0
We move all terms containing n to the left, all other terms to the right
10n=-50
n=-50/10
n=-5
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