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z in (-oo:+oo)
5-((23/2)*z) = 2*((-7/2)*z-1) // - 2*((-7/2)*z-1)
5-(2*((-7/2)*z-1))-((23/2)*z) = 0
(-23/2)*z-2*((-7/2)*z-1)+5 = 0
(-23*z)/2-2*(-7/2*z-1)+5 = 0
(-2*2*(-7/2*z-1))/2+(-23*z)/2+(2*5)/2 = 0
2*5-2*2*(-7/2*z-1)-23*z = 0
4-9*z+10 = 0
14-9*z = 0
(14-9*z)/2 = 0
(14-9*z)/2 = 0 // * 2
14-9*z = 0
14-9*z = 0 // - 14
-9*z = -14 // : -9
z = -14/(-9)
z = 14/9
z = 14/9
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