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