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g in (-oo:+oo)
(g-2)/5 = (g+4)/7 // - (g+4)/7
(g-2)/5-((g+4)/7) = 0
(g-2)/5+(-1*(g+4))/7 = 0
(7*(g-2))/(5*7)+(-1*5*(g+4))/(5*7) = 0
7*(g-2)-1*5*(g+4) = 0
2*g-34 = 0
(2*g-34)/(5*7) = 0
(2*g-34)/(5*7) = 0 // * 5*7
2*g-34 = 0
2*g-34 = 0 // + 34
2*g = 34 // : 2
g = 34/2
g = 17
g = 17
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