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z in (-oo:+oo)
(2*z)/3.4-7 = -9 // + 9
(2*z)/3.4-7+9 = 0
0.58823529*z+2 = 0 // - 2
0.58823529*z = -2 // : 0.58823529
z = -2/0.58823529
z = -3.40000002
z = -3.40000002
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