15=4.3n+2.1(n-4)

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Solution for 15=4.3n+2.1(n-4) equation:



15=4.3n+2.1(n-4)
We move all terms to the left:
15-(4.3n+2.1(n-4))=0
We calculate terms in parentheses: -(4.3n+2.1(n-4)), so:
4.3n+2.1(n-4)
We multiply parentheses
4.3n+2.1n-8.4
We add all the numbers together, and all the variables
6.4n-8.4
Back to the equation:
-(6.4n-8.4)
We get rid of parentheses
-6.4n+8.4+15=0
We add all the numbers together, and all the variables
-6.4n+23.4=0
We move all terms containing n to the left, all other terms to the right
-6.4n=-23.4
n=-23.4/-6.4
n=3+1.90909090909/2.90909090909

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