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z in (-oo:+oo)
(-4/7)*(z-15)-((1/4)*z) = 0
(-4/7)*(z-15)+(-1/4)*z = 0
-4/7*(z-15)-z/4 = 0
(-4/7*4*(z-15))/4-z/4 = 0
-4/7*4*(z-15)-z = 0
240/7-23/7*z = 0
(240/7-23/7*z)/4 = 0
(240/7-23/7*z)/4 = 0 // * 4
240/7-23/7*z = 0
240/7-23/7*z = 0 // - 240/7
-23/7*z = -240/7 // : -23/7
z = -240/7/(-23/7)
z = 240/23
z = 240/23
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