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z in (-oo:+oo)
z+z+31/6+7/2 = 12 // - 12
z+z+31/6+7/2-12 = 0
2*z-10/3 = 0 // + 10/3
2*z = 10/3 // : 2
z = 10/3/2
z = 5/3
z = 5/3
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