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G in (-oo:+oo)
G/6 > -20 // + 20
G/6+20 > 0
1/6*G+20 > 0 // - 20
1/6*G > -20 // : 1/6
G > -20/1/6
G > -120
G in (-120:+oo)
(-120:+oo)
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