add the following -5x,7x,9x,-12x
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16x-17x = -x this is what u asked
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=(-5x)+7x+9x+(-12x)
=(-5x-12x)+16x
=(-17x)+16x
=(-x)
plz mark as brainlist
=(-5x-12x)+16x
=(-17x)+16x
=(-x)
plz mark as brainlist
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