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g in (-oo:+oo)
(3*(3*g+8))/4 = 19.5 // - 19.5
(3*(3*g+8))/4-19.5 = 0
(3*(3*g+8))/4+(-19.5*4)/4 = 0
3*(3*g+8)-19.5*4 = 0
9*g-54 = 0
(9*g-54)/4 = 0
(9*g-54)/4 = 0 // * 4
9*g-54 = 0
9*g-54 = 0 // + 54
9*g = 54 // : 9
g = 54/9
g = 6
g = 6
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