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z in (-oo:+oo)
2*z+5/5 = 3*z-(z/2)+1/2+7 // - 3*z-(z/2)+1/2+7
2*z-(3*z)+z/2+5/5-(1/2)-7 = 0
2*z-3*z+z/2+5/5-1/2-7 = 0
-1/2*z-13/2 = 0 // + 13/2
-1/2*z = 13/2 // : -1/2
z = 13/2/(-1/2)
z = -13
z = -13
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