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g in (-oo:+oo)
(-4/5)*g-3 = 9 // - 9
(-4/5)*g-9-3 = 0
-4/5*g-12 = 0 // + 12
-4/5*g = 12 // : -4/5
g = 12/(-4/5)
g = -15
g = -15
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