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g in (-oo:+oo)
2/8 = g/28 // - g/28
2/8-(g/28) = 0
1/4-1/28*g = 0 // - 1/4
-1/28*g = -1/4 // : -1/28
g = -1/4/(-1/28)
g = 7
g = 7
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