3х(7х-2)-2х(9х+3)=21x²-6x-18x²-6x=3x²- 12x
если х=-4. 3*(-4)²-12*(-4)=48+48=96
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3х(7х-2)-2х(9х+3)=21x²-6x-18x²-6x=3x²- 12x
если х=-4. 3*(-4)²-12*(-4)=48+48=96