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D( g )
5*g-((15/2)*g) = 0
5*g-((15/2)*g) = 0
5*g-((15/2)*g) = 0
5*g+(-15/2)*g = 0
-5/2*g = 0 // : -5/2
g = 0
g in (-oo:0) U (0:+oo)
(g-(3/5))/(5*g-((15/2)*g)) = 0
(g-3/5)/(5*g+(-15/2)*g) = 0
(g-3/5)/(-5/2*g) = 0
g-3/5 = 0 // + 3/5
g = 3/5
g = 3/5
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