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z in (-oo:+oo)
(1/2)*(4*z+8)+2*z = (1/3)*(9*z-6)+1 // - (1/3)*(9*z-6)+1
(1/2)*(4*z+8)-((1/3)*(9*z-6))+2*z-1 = 0
(1/2)*(4*z+8)+(-1/3)*(9*z-6)+2*z-1 = 0
1/2*(4*z+8)-1/3*(9*z-6)+2*z-1 = 0
1/2*(4*z+8)-1/3*(9*z-6)+2*z-1 = 0
2*z-z-1+6 = 0
z-1+6 = 0
z+5 = 0
z+5 = 0
z+5 = 0 // - 5
z = -5
z = -5
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