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9=3(-1+k)
We move all terms to the left:
9-(3(-1+k))=0
We add all the numbers together, and all the variables
-(3(k-1))+9=0
We calculate terms in parentheses: -(3(k-1)), so:We get rid of parentheses
3(k-1)
We multiply parentheses
3k-3
Back to the equation:
-(3k-3)
-3k+3+9=0
We add all the numbers together, and all the variables
-3k+12=0
We move all terms containing k to the left, all other terms to the right
-3k=-12
k=-12/-3
k=+4
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