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z in (-oo:+oo)
(1/2)*(16*z+8)-1 = 7*(z-6) // - 7*(z-6)
(1/2)*(16*z+8)-(7*(z-6))-1 = 0
(1/2)*(16*z+8)-7*(z-6)-1 = 0
1/2*(16*z+8)-7*(z-6)-1 = 0
1/2*(16*z+8)-7*(z-6)-1 = 0
z-1+46 = 0
z+45 = 0
z+45 = 0
z+45 = 0 // - 45
z = -45
z = -45
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