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g in (-oo:+oo)
(3*(5*g+8))/2 = 27 // - 27
(3*(5*g+8))/2-27 = 0
(3*(5*g+8))/2+(-27*2)/2 = 0
3*(5*g+8)-27*2 = 0
15*g-30 = 0
(15*g-30)/2 = 0
(15*g-30)/2 = 0 // * 2
15*g-30 = 0
15*g-30 = 0 // + 30
15*g = 30 // : 15
g = 30/15
g = 2
g = 2
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