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g in (-oo:+oo)
(1/2)*g = 3/12 // - 3/12
(1/2)*g-(3/12) = 0
(1/2)*g-1/4 = 0
1/2*g-1/4 = 0 // + 1/4
1/2*g = 1/4 // : 1/2
g = 1/4/1/2
g = 1/2
g = 1/2
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