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2x²-4x-3x+6-3(x²-5x+3x-15)=
2x²-7x+6-3x²+15x-9x+45=
-x²-x+51
3x(2x-3)-x²(x-1)=
6x²-9x-x³+x²=
7x²-x³-9x
mam nadzieję,że o to chodziło i pomogłam :)