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z in (-oo:+oo)
(-9*z)/5-(2/5) = 8*z-3/2+6 // - 8*z-3/2+6
(-9*z)/5-(8*z)-(2/5)-(-3/2)-6 = 0
(-9*z)/5-8*z-2/5+3/2-6 = 0
-49/5*z-49/10 = 0 // + 49/10
-49/5*z = 49/10 // : -49/5
z = 49/10/(-49/5)
z = -1/2
z = -1/2
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