7x-(5x-5y)-y=______． 5．23a3bc2-15ab2c+8abc-24a3bc2-8abc=______． 6．-7x2+6x+13x2-4x-5x2=______． 7．2y+(-2y+5)-(3y+2)＝______． 11．(2x2-3xy+4y2)+(x2+2xy-3y2)=______． 12．2a-(3a-2b+2)+(3a-4b-1)=______． 13．-6x2-7x2+15x2-2x2＝______
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