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