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k in (-oo:+oo)
2*(-(2*k)-3) = -26 // + 26
2*(-(2*k)-3)+26 = 0
2*(-2*k-3)+26 = 0
2*(-2*k-3)+26 = 0
20-4*k = 0
20-4*k = 0
20-4*k = 0 // - 20
-4*k = -20 // : -4
k = -20/(-4)
k = 5
k = 5
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