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z in (-oo:+oo)
(1/4)*(z+4) = 3/4 // - 3/4
(1/4)*(z+4)-(3/4) = 0
(1/4)*(z+4)-3/4 = 0
1/4*(z+4)-3/4 = 0
(1/4*4*(z+4))/4-3/4 = 0
1/4*4*(z+4)-3 = 0
z+1 = 0
(z+1)/4 = 0
(z+1)/4 = 0 // * 4
z+1 = 0
z+1 = 0 // - 1
z = -1
z = -1
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