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z in (-oo:+oo)
7/9+1+2 = 2*z+1/6 // - 2*z+1/6
7/9-(2*z)-(1/6)+1+2 = 0
7/9-2*z-1/6+1+2 = 0
65/18-2*z = 0 // - 65/18
-2*z = -65/18 // : -2
z = -65/18/(-2)
z = 65/36
z = 65/36
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