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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
2/3*g+21 = 0 // - 21
2/3*g = -21 // : 2/3
g = -21/2/3
g = -63/2
g = -63/2
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