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z in (-oo:+oo)
(-1/2)*(4*z-3) = -2 // + 2
(-1/2)*(4*z-3)+2 = 0
2-1/2*(4*z-3) = 0
2-1/2*(4*z-3) = 0
7/2-2*z = 0
7/2-2*z = 0
7/2-2*z = 0 // - 7/2
-2*z = -7/2 // : -2
z = -7/2/(-2)
z = 7/4
z = 7/4
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