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z in (-oo:+oo)
z/2.95 = -7.88 // + 7.88
z/2.95+7.88 = 0
0.33898305*z+7.88 = 0 // - 7.88
0.33898305*z = -7.88 // : 0.33898305
z = -7.88/0.33898305
z = -23.24600006
z = -23.24600006
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