2(1,0) - 3(2,-1) = (-4,3)
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42, because if there is nothing between the 7 and 'a' and 'a' equals 6 then the answer is 42.
It is some sort of an algebraic expression.
The question contains only an expression. There is no property illustrated.
0.42
1 x 42, 2 x 21, 3 x 14, 6 x 7, 7 x 6, 14 x 3, 21 x 2, 42 x 1