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g in (-oo:+oo)
12/40 = g/10 // - g/10
12/40-(g/10) = 0
3/10-1/10*g = 0 // - 3/10
-1/10*g = -3/10 // : -1/10
g = -3/10/(-1/10)
g = 3
g = 3
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