21=-5k+7k-3

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Solution for 21=-5k+7k-3 equation: 


k in (-oo:+oo)

21 = 7*k-5*k-3 // - 7*k-5*k-3

3-(-5*k)-(7*k)+21 = 0

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

24-2*k = 0 // - 24

-2*k = -24 // : -2

k = -24/(-2)

k = 12

k = 12

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