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G in (-oo:+oo)
G/42 = 21/18 // - 21/18
G/42-(21/18) = 0
G/42-7/6 = 0
1/42*G-7/6 = 0 // + 7/6
1/42*G = 7/6 // : 1/42
G = 7/6/1/42
G = 49
G = 49
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