It is: 12g+9g = 21g
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If you're saying that: 12g-19 = 3g-31 then, Swap the sides around, getting common factors all on one side. E.G. 12g-3g = -31+19 9g = -12 g = -12/9 g = -1.333... or -4/3 Alternatively: 12g-19 = 3g-31 9g-19 = -31 9g = -12 g = -12/9 g = -1.333... or -4/3
12g
16g - 7
12 of anything plus 7 more of them produces 19 of the same thing.
In order. 11 - 9 = 2 2 + 8 = 10 The answer is 10g