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z in (-oo:+oo)
z/6.8 = -0.2 // + 0.2
z/6.8+0.2 = 0
0.14705882*z+0.2 = 0 // - 0.2
0.14705882*z = -0.2 // : 0.14705882
z = -0.2/0.14705882
z = -1.36000003
z = -1.36000003
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