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g in (-oo:+oo)
7 = 10/(-2)-(g/(-2)) // - 10/(-2)-(g/(-2))
g/(-2)-(10/(-2))+7 = 0
g/(-2)+5+7 = 0
12-1/2*g = 0 // - 12
-1/2*g = -12 // : -1/2
g = -12/(-1/2)
g = 24
g = 24
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