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189=7(9+n)
We move all terms to the left:
189-(7(9+n))=0
We add all the numbers together, and all the variables
-(7(n+9))+189=0
We calculate terms in parentheses: -(7(n+9)), so:We get rid of parentheses
7(n+9)
We multiply parentheses
7n+63
Back to the equation:
-(7n+63)
-7n-63+189=0
We add all the numbers together, and all the variables
-7n+126=0
We move all terms containing n to the left, all other terms to the right
-7n=-126
n=-126/-7
n=+18
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