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z in (-oo:+oo)
2*z-(6/4) = -7 // + 7
2*z-(6/4)+7 = 0
2*z-3/2+7 = 0
2*z+11/2 = 0 // - 11/2
2*z = -11/2 // : 2
z = -11/2/2
z = -11/4
z = -11/4
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