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2x²+2x-3x-3=3x²-12
2x²-x-3=3x²-12
2x²-3x²-x=-12+3
-x²-x=-9
-x²-x+9=0
2x*+2x-3x-3=3x*-12
2x*-x-3=3x*-12
2x*-3x*-x=-12+3
-x*-x=-9
-x*-x-9=0