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z in (-oo:+oo)
z*((11*z-5)/5)-(z*((11*z+15)/5)) = 0
(z*(11*z-5))/5+(-1*z*(11*z+15))/5 = 0
z*(11*z-5)-1*z*(11*z+15) = 0
-20*z = 0
(-20*z)/5 = 0
(-20*z)/5 = 0 // * 5
-20*z = 0
-20*z = 0 // : -20
z = 0
z = 0
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