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-3(k+-10)=12
We move all terms to the left:
-3(k+-10)-(12)=0
We add all the numbers together, and all the variables
-3(k-10)-12=0
We multiply parentheses
-3k+30-12=0
We add all the numbers together, and all the variables
-3k+18=0
We move all terms containing k to the left, all other terms to the right
-3k=-18
k=-18/-3
k=+6
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