3x(-1)(-1)(-1)-4(-1)(-1)+5(-1)-6
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3x(-1)(-1)(-1)-4(-1)(-1)+5(-1)-6
= -3x-4(-1)(-1)+5(-1)-6
= -3x-4+5(-1)-6
= -3x-4-5-6
= -3x-15
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