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g in (-oo:+oo)
(7*(5*g+6))/2+56 = 0
(7*(5*g+6))/2+(2*56)/2 = 0
7*(5*g+6)+2*56 = 0
35*g+154 = 0
(35*g+154)/2 = 0
(35*g+154)/2 = 0 // * 2
35*g+154 = 0
35*g+154 = 0 // - 154
35*g = -154 // : 35
g = -154/35
g = -22/5
g = -22/5
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