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z in (-oo:+oo)
z/6.2 = -2.1 // + 2.1
z/6.2+2.1 = 0
0.16129032*z+2.1 = 0 // - 2.1
0.16129032*z = -2.1 // : 0.16129032
z = -2.1/0.16129032
z = -13.02000021
z = -13.02000021
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