X = 2, y = 1 is a solution of binary linear equation AX-2 = - by, then the value of 4a-2b-6 is equal to how many processes~
It should be x = 2, y = - 1
So 2a-2 = B
So 2a-b = 2
Double two on both sides
4a-2b=4
4a-2b-6=4-6=-2
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