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g in (-oo:+oo)
(5*(7*g+6))/2 = 85 // - 85
(5*(7*g+6))/2-85 = 0
(5*(7*g+6))/2+(-85*2)/2 = 0
5*(7*g+6)-85*2 = 0
35*g-140 = 0
(35*g-140)/2 = 0
(35*g-140)/2 = 0 // * 2
35*g-140 = 0
35*g-140 = 0 // + 140
35*g = 140 // : 35
g = 140/35
g = 4
g = 4
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