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g in (-oo:+oo)
-4 = (1/3)*(9-g) // - (1/3)*(9-g)
-((1/3)*(9-g))-4 = 0
(-1/3)*(9-g)-4 = 0
-1/3*(9-g)-4 = 0
-1/3*(9-g)-4 = 0
1/3*g-7 = 0
1/3*g-7 = 0
1/3*g-7 = 0 // + 7
1/3*g = 7 // : 1/3
g = 7/1/3
g = 21
g = 21
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