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