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7(3n+1)=7(9n+1)+3
We move all terms to the left:
7(3n+1)-(7(9n+1)+3)=0
We multiply parentheses
21n-(7(9n+1)+3)+7=0
We calculate terms in parentheses: -(7(9n+1)+3), so:We get rid of parentheses
7(9n+1)+3
We multiply parentheses
63n+7+3
We add all the numbers together, and all the variables
63n+10
Back to the equation:
-(63n+10)
21n-63n-10+7=0
We add all the numbers together, and all the variables
-42n-3=0
We move all terms containing n to the left, all other terms to the right
-42n=3
n=3/-42
n=-1/14
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