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Z in (-oo:+oo)
(Z-4)/(-2) = 13 // - 13
(Z-4)/(-2)-13 = 0
(Z-4)/(-2)+(-13*(-2))/(-2) = 0
Z-13*(-2)-4 = 0
Z+22 = 0
(Z+22)/(-2) = 0
(Z+22)/(-2) = 0 // * -2
Z+22 = 0
Z+22 = 0 // - 22
Z = -22
Z = -22
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