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g in (-oo:+oo)
3-((21/2)*g) = -g // + g
g-((21/2)*g)+3 = 0
(-21/2)*g+g+3 = 0
3-19/2*g = 0 // - 3
-19/2*g = -3 // : -19/2
g = -3/(-19/2)
g = 6/19
g = 6/19
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