12 of anything plus 7 more of them produces 19 of the same thing.
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It is: 12g+9g = 21g
4
12g
16g - 7
It is a linear equation in three variables which is equivalent to a linear equation in two variables. This is because 3 + e = 2.3f +e - 7g is equivalent to 3 = 2.3f -7g