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g in (-oo:+oo)
(7*(5*g+4))/2 = 154 // - 154
(7*(5*g+4))/2-154 = 0
(7*(5*g+4))/2+(-154*2)/2 = 0
7*(5*g+4)-154*2 = 0
35*g-280 = 0
(35*g-280)/2 = 0
(35*g-280)/2 = 0 // * 2
35*g-280 = 0
35*g-280 = 0 // + 280
35*g = 280 // : 35
g = 280/35
g = 8
g = 8
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