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g in (-oo:+oo)
9-((1/3)*g) = 13 // - 13
9-((1/3)*g)-13 = 0
(-1/3)*g-13+9 = 0
-1/3*g-4 = 0 // + 4
-1/3*g = 4 // : -1/3
g = 4/(-1/3)
g = -12
g = -12
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