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8(12-k)=3k+63
We move all terms to the left:
8(12-k)-(3k+63)=0
We add all the numbers together, and all the variables
8(-1k+12)-(3k+63)=0
We multiply parentheses
-8k-(3k+63)+96=0
We get rid of parentheses
-8k-3k-63+96=0
We add all the numbers together, and all the variables
-11k+33=0
We move all terms containing k to the left, all other terms to the right
-11k=-33
k=-33/-11
k=+3
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