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z in (-oo:+oo)
(1/2)*(z-(4/5)) = -((1/6)*(z+4)) // + (1/6)*(z+4)
(1/2)*(z-(4/5))+(1/6)*(z+4) = 0
(1/2)*(z-4/5)+(1/6)*(z+4) = 0
1/2*(z-4/5)+1/6*(z+4) = 0
1/2*(z-4/5)+1/6*(z+4) = 0
2/3*z+4/15 = 0
2/3*z+4/15 = 0
2/3*z+4/15 = 0 // - 4/15
2/3*z = -4/15 // : 2/3
z = -4/15/2/3
z = -2/5
z = -2/5
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