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g in (-oo:+oo)
(-1/2)*g+2 = 6 // - 6
(-1/2)*g-6+2 = 0
-1/2*g-4 = 0 // + 4
-1/2*g = 4 // : -1/2
g = 4/(-1/2)
g = -8
g = -8
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