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