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z in (-oo:+oo)
25-(z/8) = 15.5 // - 15.5
25-(z/8)-15.5 = 0
9.5-1/8*z = 0 // - 9.5
-1/8*z = -9.5 // : -1/8
z = -9.5/(-1/8)
z = 76
z = 76
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