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g in (-oo:+oo)
21 = (2/3)*g // - (2/3)*g
21-((2/3)*g) = 0
(-2/3)*g+21 = 0
21-2/3*g = 0 // - 21
-2/3*g = -21 // : -2/3
g = -21/(-2/3)
g = 63/2
g = 63/2
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