(3x+8)(6x+7) - (2x-1)(5x-4)
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(3x+8)(6x+7) - (2x-1)(5x-4)
= [3x(6x+7)+8(6x+7)] - [2x(5x-4) -1(5x-4)]
= (18x+21x+48x+56) - (10x-8x-5x-4)
= (87x+56) - (-3x-4)
= 87x+56+3x+4
= 90x+60
= [3x(6x+7)+8(6x+7)] - [2x(5x-4) -1(5x-4)]
= (18x+21x+48x+56) - (10x-8x-5x-4)
= (87x+56) - (-3x-4)
= 87x+56+3x+4
= 90x+60
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