12b^3-(12b^3-8b^2-3b+2)=12b^3-12b^3+8b^2+3b-2=8b^2+3b-2.
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12b^3-(12b^3-8b^2-3b+2)=12b^3-12b^3+8b^2+3b-2=8b^2+3b-2.