Solve for k
k=3
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3k+k-12=0
Combine 7k and -4k to get 3k.
4k-12=0
Combine 3k and k to get 4k.
4k=12
Add 12 to both sides. Anything plus zero gives itself.
k=\frac{12}{4}
Divide both sides by 4.
k=3
Divide 12 by 4 to get 3.
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