40=2k+2k-4

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Solution for 40=2k+2k-4 equation: 


k in (-oo:+oo)

40 = 2*k+2*k-4 // - 2*k+2*k-4

4-(2*k)-(2*k)+40 = 0

4-2*k-2*k+40 = 0

44-4*k = 0 // - 44

-4*k = -44 // : -4

k = -44/(-4)

k = 11

k = 11

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