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z in (-oo:+oo)
1.86 = (-6.2*z)/8 // - (-6.2*z)/8
1.86-((-6.2*z)/8) = 0
0.775*z+1.86 = 0
0.775*z+1.86 = 0 // - 1.86
0.775*z = -1.86 // : 0.775
z = -1.86/0.775
z = -2.4
z = -2.4
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