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z in (-oo:+oo)
z/4 = -1/40 // + -1/40
z/4-(-1/40) = 0
z/4+1/40 = 0
1/4*z+1/40 = 0 // - 1/40
1/4*z = -1/40 // : 1/4
z = -1/40/1/4
z = -1/10
z = -1/10
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