5,1 -(b+1,2) = 7
5,1-b-1,2 = 7
-b = 7-5,1+1,2
-b = 3,1
b = -3,1
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Verified answer
5,1 -(b+1,2) = 7
5,1-b-1,2 = 7
-b = 7-5,1+1,2
-b = 3,1
b = -3,1