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z in (-oo:+oo)
z/7 = ((4*z)/35)*z+2 // - ((4*z)/35)*z+2
z/7-(((4*z)/35)*z)-2 = 0
(-4/35)*z^2+z/7-2 = 0
1/7*z-4/35*z^2-2 = 0
DELTA = (1/7)^2-(-2*(-4/35)*4)
DELTA = -219/245
DELTA < 0
z belongs to the empty set
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