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z in (-oo:+oo)
z/4 = -1/38 // + -1/38
z/4-(-1/38) = 0
z/4+1/38 = 0
1/4*z+1/38 = 0 // - 1/38
1/4*z = -1/38 // : 1/4
z = -1/38/1/4
z = -2/19
z = -2/19
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