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g in (-oo:+oo)
(5*(5*g+6))/2 = 65 // - 65
(5*(5*g+6))/2-65 = 0
(5*(5*g+6))/2+(-65*2)/2 = 0
5*(5*g+6)-65*2 = 0
25*g-100 = 0
(25*g-100)/2 = 0
(25*g-100)/2 = 0 // * 2
25*g-100 = 0
25*g-100 = 0 // + 100
25*g = 100 // : 25
g = 100/25
g = 4
g = 4
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