=5x -1 - (6x+7)
=5x -1 -6x -7
= 5x -6x -1 -7
= -1x -8
= -x-8
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Verified answer
=5x -1 - (6x+7)
=5x -1 -6x -7
= 5x -6x -1 -7
= -1x -8
= -x-8
= 6x+7-5x+1
= 6x-5x+7+1
= x+8