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the answer of this question is-21
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=3y(2y-7) - 3 (y-4) -63
=6y^2-21y-3y-12-63
=6y^2-24y-51
then putting y = -2
=6(-2)^2-24 (-2)-51
=6×4(-24 ×-2)-51
=24+48 -51
=72-51
= 21
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