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z in (-oo:+oo)
z+z+9/6+18/5 = 4 // - 4
z+z+9/6+18/5-4 = 0
2*z+11/10 = 0 // - 11/10
2*z = -11/10 // : 2
z = -11/10/2
z = -11/20
z = -11/20
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