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z in (-oo:+oo)
(-5/2)*z+8 = -3/4 // + -3/4
(-5/2)*z-(-3/4)+8 = 0
(-5/2)*z+3/4+8 = 0
35/4-5/2*z = 0 // - 35/4
-5/2*z = -35/4 // : -5/2
z = -35/4/(-5/2)
z = 7/2
z = 7/2
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