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z in (-oo:+oo)
25-(z/8) = 12.5 // - 12.5
25-(z/8)-12.5 = 0
12.5-1/8*z = 0 // - 12.5
-1/8*z = -12.5 // : -1/8
z = -12.5/(-1/8)
z = 100
z = 100
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