3(-1k-3)=-21

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Solution for 3(-1k-3)=-21 equation: 


k in (-oo:+oo)

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

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

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

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

12-3*k = 0

12-3*k = 0

12-3*k = 0 // - 12

-3*k = -12 // : -3

k = -12/(-3)

k = 4

k = 4

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