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z in (-oo:+oo)
(1/4)*(4*z-12) = 22 // - 22
(1/4)*(4*z-12)-22 = 0
1/4*(4*z-12)-22 = 0
1/4*(4*z-12)-22 = 0
z-25 = 0
z-25 = 0
z-25 = 0 // + 25
z = 25
z = 25
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