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k+4=-21+6k
We move all terms to the left:
k+4-(-21+6k)=0
We add all the numbers together, and all the variables
k-(6k-21)+4=0
We get rid of parentheses
k-6k+21+4=0
We add all the numbers together, and all the variables
-5k+25=0
We move all terms containing k to the left, all other terms to the right
-5k=-25
k=-25/-5
k=+5
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