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G in (-oo:+oo)
G/2+6 = 12.1 // - 12.1
G/2-12.1+6 = 0
1/2*G-6.1 = 0 // + 6.1
1/2*G = 6.1 // : 1/2
G = 6.1/1/2
G = 12.2
G = 12.2
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