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g in (-oo:+oo)
(12*g)/5-(2*g) = 3/10 // - 3/10
(12*g)/5-(2*g)-(3/10) = 0
(12*g)/5-2*g-3/10 = 0
2/5*g-3/10 = 0 // + 3/10
2/5*g = 3/10 // : 2/5
g = 3/10/2/5
g = 3/4
g = 3/4
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