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z in (-oo:+oo)
z+3/6+1 = 2*z+7/4 // - 2*z+7/4
z-(2*z)+3/6-(7/4)+1 = 0
z-2*z+3/6-7/4+1 = 0
-z-1/4 = 0 // + 1/4
-z = 1/4 // * -1
z = -1/4
z = -1/4
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