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g in (-oo:+oo)
g/2.1 = -6 // + 6
g/2.1+6 = 0
0.47619048*g+6 = 0 // - 6
0.47619048*g = -6 // : 0.47619048
g = -6/0.47619048
g = -12.5999999
g = -12.5999999
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