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74=-7(1+3n)+6(7n+3)
We move all terms to the left:
74-(-7(1+3n)+6(7n+3))=0
We add all the numbers together, and all the variables
-(-7(3n+1)+6(7n+3))+74=0
We calculate terms in parentheses: -(-7(3n+1)+6(7n+3)), so:We get rid of parentheses
-7(3n+1)+6(7n+3)
We multiply parentheses
-21n+42n-7+18
We add all the numbers together, and all the variables
21n+11
Back to the equation:
-(21n+11)
-21n-11+74=0
We add all the numbers together, and all the variables
-21n+63=0
We move all terms containing n to the left, all other terms to the right
-21n=-63
n=-63/-21
n=+3
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