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g in (-oo:+oo)
-g = (21/2)*g-3 // - (21/2)*g-3
3-g-((21/2)*g) = 0
(-21/2)*g-g+3 = 0
3-23/2*g = 0 // - 3
-23/2*g = -3 // : -23/2
g = -3/(-23/2)
g = 6/23
g = 6/23
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