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g in (-oo:+oo)
(7*(5*g+2))/2 = 112 // - 112
(7*(5*g+2))/2-112 = 0
(7*(5*g+2))/2+(-112*2)/2 = 0
7*(5*g+2)-112*2 = 0
35*g-210 = 0
(35*g-210)/2 = 0
(35*g-210)/2 = 0 // * 2
35*g-210 = 0
35*g-210 = 0 // + 210
35*g = 210 // : 35
g = 210/35
g = 6
g = 6
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