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7(3n+3)=6(6n+2)+9
We move all terms to the left:
7(3n+3)-(6(6n+2)+9)=0
We multiply parentheses
21n-(6(6n+2)+9)+21=0
We calculate terms in parentheses: -(6(6n+2)+9), so:We get rid of parentheses
6(6n+2)+9
We multiply parentheses
36n+12+9
We add all the numbers together, and all the variables
36n+21
Back to the equation:
-(36n+21)
21n-36n-21+21=0
We add all the numbers together, and all the variables
-15n=0
n=0/-15
n=0
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