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40=10(2n-6)
We move all terms to the left:
40-(10(2n-6))=0
We calculate terms in parentheses: -(10(2n-6)), so:We get rid of parentheses
10(2n-6)
We multiply parentheses
20n-60
Back to the equation:
-(20n-60)
-20n+60+40=0
We add all the numbers together, and all the variables
-20n+100=0
We move all terms containing n to the left, all other terms to the right
-20n=-100
n=-100/-20
n=+5
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