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z in (-oo:+oo)
40/65 = (2*z)/104 // - (2*z)/104
40/65-((2*z)/104) = 0
(-1/52)*z+40/65 = 0
8/13-1/52*z = 0 // - 8/13
-1/52*z = -8/13 // : -1/52
z = -8/13/(-1/52)
z = 32
z = 32
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