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z in (-oo:+oo)
-15 = (5/7)*(4*z-1) // - (5/7)*(4*z-1)
-((5/7)*(4*z-1))-15 = 0
(-5/7)*(4*z-1)-15 = 0
-5/7*(4*z-1)-15 = 0
-5/7*(4*z-1)-15 = 0
-20/7*z-100/7 = 0
-20/7*z-100/7 = 0
-20/7*z-100/7 = 0 // + 100/7
-20/7*z = 100/7 // : -20/7
z = 100/7/(-20/7)
z = -5
z = -5
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