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z in (-oo:+oo)
(4*z-12)/2 = 22 // - 22
(4*z-12)/2-22 = 0
(4*z-12)/2+(-22*2)/2 = 0
4*z-22*2-12 = 0
4*z-56 = 0
(4*z-56)/2 = 0
(4*z-56)/2 = 0 // * 2
4*z-56 = 0
4*z-56 = 0 // + 56
4*z = 56 // : 4
z = 56/4
z = 14
z = 14
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