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z in (-oo:+oo)
-z-21 = z/49 // - z/49
-z-(z/49)-21 = 0
-50/49*z-21 = 0 // + 21
-50/49*z = 21 // : -50/49
z = 21/(-50/49)
z = -1029/50
z = -1029/50
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