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g in (-oo:+oo)
-((2*g+1/7)*(-(2*g)-4/7)) = 0
-((2*g+1/7)*(-2*g-4/7)) = 0
-1*(2*g+1/7)*(-2*g-4/7) = 0
( -2*g-4/7 )
-2*g-4/7 = 0 // + 4/7
-2*g = 4/7 // : -2
g = 4/7/(-2)
g = -2/7
( 2*g+1/7 )
2*g+1/7 = 0 // - 1/7
2*g = -1/7 // : 2
g = -1/7/2
g = -1/14
g in { -2/7, -1/14 }
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