12g is 12/14, or 6/7, of 14g.
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12g-9 = 3
It is: 12g+9g = 21g
you take and and divide 14g by 14 and you must also divide 4.28 by 14. So 14g divided by 14 which cancels the 14 and leaves g. You divide 4.28 by 14 which equals 0.305714285, so g equals 0.305714852.
14g + 7
16g - 7