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z in (-oo:+oo)
2.25-(3*z) = 0.375-((3/4)*z) // - 0.375-((3/4)*z)
(3/4)*z-(3*z)-0.375+2.25 = 0
(3/4)*z-3*z-0.375+2.25 = 0
1.875-9/4*z = 0 // - 1.875
-9/4*z = -1.875 // : -9/4
z = -1.875/(-9/4)
z = 0.83333333
z = 0.83333333
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