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z in (-oo:+oo)
z/6+2 = 7/6 // - 7/6
z/6-(7/6)+2 = 0
z/6-7/6+2 = 0
1/6*z+5/6 = 0 // - 5/6
1/6*z = -5/6 // : 1/6
z = -5/6/1/6
z = -5
z = -5
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