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z in (-oo:+oo)
5 = 2*((-7*z)/2-1)+10*z // - 2*((-7*z)/2-1)+10*z
5-(2*((-7*z)/2-1))-(10*z) = 0
5-2*((-7*z)/2-1)-10*z = 0
5-2*(-7/2*z-1)-10*z = 0
5-2*(-7/2*z-1)-10*z = 0
2-3*z+5 = 0
7-3*z = 0
7-3*z = 0
7-3*z = 0 // - 7
-3*z = -7 // : -3
z = -7/(-3)
z = 7/3
z = 7/3
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