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g in (-oo:+oo)
(5*(5*g+6))/2 = 90 // - 90
(5*(5*g+6))/2-90 = 0
(5*(5*g+6))/2+(-90*2)/2 = 0
5*(5*g+6)-90*2 = 0
25*g-150 = 0
(25*g-150)/2 = 0
(25*g-150)/2 = 0 // * 2
25*g-150 = 0
25*g-150 = 0 // + 150
25*g = 150 // : 25
g = 150/25
g = 6
g = 6
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