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z in (-oo:+oo)
z/7 = -15.5 // + 15.5
z/7+15.5 = 0
1/7*z+15.5 = 0 // - 15.5
1/7*z = -15.5 // : 1/7
z = -15.5/1/7
z = -108.50000217
z = -108.50000217
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