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z in (-oo:+oo)
-z/4 = 10/7 // - 10/7
-z/4-(10/7) = 0
-z/4-10/7 = 0
-1/4*z-10/7 = 0 // + 10/7
-1/4*z = 10/7 // : -1/4
z = 10/7/(-1/4)
z = -40/7
z = -40/7
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