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-45=3(1-3n)-3n
We move all terms to the left:
-45-(3(1-3n)-3n)=0
We add all the numbers together, and all the variables
-(3(-3n+1)-3n)-45=0
We calculate terms in parentheses: -(3(-3n+1)-3n), so:We get rid of parentheses
3(-3n+1)-3n
We add all the numbers together, and all the variables
-3n+3(-3n+1)
We multiply parentheses
-3n-9n+3
We add all the numbers together, and all the variables
-12n+3
Back to the equation:
-(-12n+3)
12n-3-45=0
We add all the numbers together, and all the variables
12n-48=0
We move all terms containing n to the left, all other terms to the right
12n=48
n=48/12
n=4
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