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z in (-oo:+oo)
(-1/4)*z = -8.5 // + 8.5
(-1/4)*z+8.5 = 0
8.5-1/4*z = 0 // - 8.5
-1/4*z = -8.5 // : -1/4
z = -8.5/(-1/4)
z = 34
z = 34
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