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g in (-oo:+oo)
-12.1 = g/4-16 // - g/4-16
16-(g/4)-12.1 = 0
3.9-1/4*g = 0 // - 3.9
-1/4*g = -3.9 // : -1/4
g = -3.9/(-1/4)
g = 15.6
g = 15.6
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