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g in (-oo:+oo)
15*g = 1/2 // - 1/2
15*g-(1/2) = 0
15*g-1/2 = 0
15*g-1/2 = 0 // + 1/2
15*g = 1/2 // : 15
g = 1/2/15
g = 1/30
g = 1/30
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