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13x2-[7x-4x-3-2x2]22x-3y-3x+2y+13a2-9a+5--7a2+10a-55a-3a2+1-4a3-3a22(8xyx2y2)(y2x28xy)(3a2bab2)(ab23a2b)(x254x3)(x35x4)5x2y-7xy2-xy2-3x2y33x2-[5x-4(21x2-1)]+5x2a2b-[2a2b-2a2c-2bc+a2c]5m-7n-8p+5n-9m-p5x2y-7xy2-xy2-3x2y4-3a2b-2ab2-a2b-2a2b+4ab2-[2m-3m-n+1-2]-1x2y-3xy2+2yx2-y2x8xy2+3x2y-2+-2x2y+5xy2-355abc-{2a2b-[3abc-4ab2-a2b]-2ab2}2x2-3xy+y2+2x+2y4x2-6xy+2y2-3x-y67