1-3k=-7k+21

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Solution for 1-3k=-7k+21 equation: 


k in (-oo:+oo)

1-(3*k) = 21-7*k // - 21-7*k

1-(3*k)-(-7*k)-21 = 0

7*k-3*k-21+1 = 0

4*k-20 = 0 // + 20

4*k = 20 // : 4

k = 20/4

k = 5

k = 5

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