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3=(9-n)/4
We move all terms to the left:
3-((9-n)/4)=0
We add all the numbers together, and all the variables
-((-1n+9)/4)+3=0
We multiply all the terms by the denominator
-((-1n+9)+3*4)=0
We calculate terms in parentheses: -((-1n+9)+3*4), so:We get rid of parentheses
(-1n+9)+3*4
We add all the numbers together, and all the variables
(-1n+9)+12
We get rid of parentheses
-1n+9+12
We add all the numbers together, and all the variables
-1n+21
Back to the equation:
-(-1n+21)
1n-21=0
We add all the numbers together, and all the variables
n-21=0
We move all terms containing n to the left, all other terms to the right
n=21
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