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g in (-oo:+oo)
(3*(5*g+6))/4 = 19.5 // - 19.5
(3*(5*g+6))/4-19.5 = 0
(3*(5*g+6))/4+(-19.5*4)/4 = 0
3*(5*g+6)-19.5*4 = 0
15*g-60 = 0
(15*g-60)/4 = 0
(15*g-60)/4 = 0 // * 4
15*g-60 = 0
15*g-60 = 0 // + 60
15*g = 60 // : 15
g = 60/15
g = 4
g = 4
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