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z in (-oo:+oo)
2.5/35 = z/36 // - z/36
2.5/35-(z/36) = 0
0.07142857-1/36*z = 0 // - 0.07142857
-1/36*z = -0.07142857 // : -1/36
z = -0.07142857/(-1/36)
z = 2.57142831
z = 2.57142831
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