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-10=7+k
We move all terms to the left:
-10-(7+k)=0
We add all the numbers together, and all the variables
-(k+7)-10=0
We get rid of parentheses
-k-7-10=0
We add all the numbers together, and all the variables
-1k-17=0
We move all terms containing k to the left, all other terms to the right
-k=17
k=17/-1
k=-17
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