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z in (-oo:+oo)
(z-6)/5+z = (4*z+16)/5 // - (4*z+16)/5
(z-6)/5-((4*z+16)/5)+z = 0
(z-6)/5+(-1*(4*z+16))/5+z = 0
(z-6)/5+(-1*(4*z+16))/5+(5*z)/5 = 0
z-1*(4*z+16)+5*z-6 = 0
5*z-3*z-22 = 0
2*z-22 = 0
(2*z-22)/5 = 0
(2*z-22)/5 = 0 // * 5
2*z-22 = 0
2*z-22 = 0 // + 22
2*z = 22 // : 2
z = 22/2
z = 11
z = 11
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