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g in (-oo:+oo)
(2*g)/0.5 >= -4/0.5 // + -4/0.5
(2*g)/0.5-(-4/0.5) >= 0
(2*g)/0.5+8 >= 0
4*g+8 >= 0 // - 8
4*g >= -8 // : 4
g >= -8/4
g >= -2
g in <-2:+oo)
<-2:+oo)
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