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g in (-oo:+oo)
12/48 = g/20 // - g/20
12/48-(g/20) = 0
1/4-1/20*g = 0 // - 1/4
-1/20*g = -1/4 // : -1/20
g = -1/4/(-1/20)
g = 5
g = 5
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