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z in (-oo:+oo)
-19 = z/7-10 // - z/7-10
10-(z/7)-19 = 0
-1/7*z-9 = 0 // + 9
-1/7*z = 9 // : -1/7
z = 9/(-1/7)
z = -63
z = -63
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