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(5x²-5x+4)-(2x²-3x+7) = 3x²-2x-3
[4-5x+5xpangkat2]-[2xpangkat2-3x+7]=
4-5x+5xpangkat2-2xpangkat2+3x-7=
4-7-5x+3x+5xpangkat2-2xpangkat2
-3-2x+3xpangkat2