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g in (-oo:+oo)
(5/9)*(g+18) = (1/6)*g+3 // - (1/6)*g+3
(5/9)*(g+18)-((1/6)*g)-3 = 0
(5/9)*(g+18)+(-1/6)*g-3 = 0
5/9*(g+18)-g/6-3 = 0
(5/9*6*(g+18))/6-g/6+(-3*6)/6 = 0
5/9*6*(g+18)-g-3*6 = 0
7/3*g-18+60 = 0
7/3*g+42 = 0
(7/3*g+42)/6 = 0
(7/3*g+42)/6 = 0 // * 6
7/3*g+42 = 0
7/3*g+42 = 0 // - 42
7/3*g = -42 // : 7/3
g = -42/7/3
g = -18
g = -18
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