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k+6=k+2(k+1)
We move all terms to the left:
k+6-(k+2(k+1))=0
We calculate terms in parentheses: -(k+2(k+1)), so:We get rid of parentheses
k+2(k+1)
We multiply parentheses
k+2k+2
We add all the numbers together, and all the variables
3k+2
Back to the equation:
-(3k+2)
k-3k-2+6=0
We add all the numbers together, and all the variables
-2k+4=0
We move all terms containing k to the left, all other terms to the right
-2k=-4
k=-4/-2
k=+2
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