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g in (-oo:+oo)
(3*(3*g+2))/2 = 30 // - 30
(3*(3*g+2))/2-30 = 0
(3*(3*g+2))/2+(-30*2)/2 = 0
3*(3*g+2)-30*2 = 0
9*g-54 = 0
(9*g-54)/2 = 0
(9*g-54)/2 = 0 // * 2
9*g-54 = 0
9*g-54 = 0 // + 54
9*g = 54 // : 9
g = 54/9
g = 6
g = 6
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