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g in (-oo:+oo)
(7*(9*g+2))/2 = 259 // - 259
(7*(9*g+2))/2-259 = 0
(7*(9*g+2))/2+(-259*2)/2 = 0
7*(9*g+2)-259*2 = 0
63*g-504 = 0
(63*g-504)/2 = 0
(63*g-504)/2 = 0 // * 2
63*g-504 = 0
63*g-504 = 0 // + 504
63*g = 504 // : 63
g = 504/63
g = 8
g = 8
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