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