12(x 2 +7)-8(x 2 +7)(2x -1)-15(2x-1) 2
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=12 (9)- 8 (9) (-2) - 15 (-2) 2
=108 - 72 (-2) -15 (-4)
=108 + 144 + 60
=402
=108 - 72 (-2) -15 (-4)
=108 + 144 + 60
=402
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