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z in (-oo:+oo)
66 = (2*z)/5-8 // - (2*z)/5-8
8-((2*z)/5)+66 = 0
(-2/5)*z+8+66 = 0
74-2/5*z = 0 // - 74
-2/5*z = -74 // : -2/5
z = -74/(-2/5)
z = 185
z = 185
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