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z in (-oo:+oo)
z = (1/2)*z+(1/3)*z+(1/5)*z+(1/6)*z-6 // - (1/2)*z+(1/3)*z+(1/5)*z+(1/6)*z-6
z-((1/2)*z)-((1/3)*z)-((1/5)*z)-((1/6)*z)+6 = 0
z+(-1/2)*z+(-1/3)*z+(-1/5)*z+(-1/6)*z+6 = 0
6-1/5*z = 0 // - 6
-1/5*z = -6 // : -1/5
z = -6/(-1/5)
z = 30
z = 30
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