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z in (-oo:+oo)
(1/12)*(4*z+27) = (1/4)*(2*z+5) // - (1/4)*(2*z+5)
(1/12)*(4*z+27)-((1/4)*(2*z+5)) = 0
(1/12)*(4*z+27)+(-1/4)*(2*z+5) = 0
1/12*(4*z+27)-1/4*(2*z+5) = 0
1/12*(4*z+27)-1/4*(2*z+5) = 0
1-1/6*z = 0
1-1/6*z = 0
1-1/6*z = 0 // - 1
-1/6*z = -1 // : -1/6
z = -1/(-1/6)
z = 6
z = 6
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