First simplify and then evaluate 1A / 2 minus (2a minus the square of 2B / 3), where a is negative and 1B / 2 equals 1

a/2-(2a-2/3b^2)+(-3/2a+1/3b^2)
=a/2-2a+2/3b^2-3/2a+1/3b^2
=-3a+b^2
=-3(-1/2)+(1)^2
=7/2+1
=9/2
Do you understand?

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