2k-1=7k-21

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Solution for 2k-1=7k-21 equation: 


k in (-oo:+oo)

2*k-1 = 7*k-21 // - 7*k-21

2*k-(7*k)-1+21 = 0

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

20-5*k = 0 // - 20

-5*k = -20 // : -5

k = -20/(-5)

k = 4

k = 4

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