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The tangent to y = ax ^(2)+ bx + (7 )/(2...

The tangent to `y = ax ^(2)+ bx + (7 )/(2) at (1,2)` is parallel to the normal at the point `(-2,2)` on the curve `y = x ^(2)+6x+10.` Then the vlaue of `a/2-b` is:

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