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g in (-oo:+oo)
(6/5)*(5-(2*g)) = 18 // - 18
(6/5)*(5-(2*g))-18 = 0
(6/5)*(5-2*g)-18 = 0
6/5*(5-2*g)-18 = 0
6/5*(5-2*g)-18 = 0
-12/5*g-12 = 0
-12/5*g-12 = 0
-12/5*g-12 = 0 // + 12
-12/5*g = 12 // : -12/5
g = 12/(-12/5)
g = -5
g = -5
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