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g in (-oo:+oo)
(9*(7*g+8))/2 = 225 // - 225
(9*(7*g+8))/2-225 = 0
(9*(7*g+8))/2+(-225*2)/2 = 0
9*(7*g+8)-225*2 = 0
63*g-378 = 0
(63*g-378)/2 = 0
(63*g-378)/2 = 0 // * 2
63*g-378 = 0
63*g-378 = 0 // + 378
63*g = 378 // : 63
g = 378/63
g = 6
g = 6
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