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b)8a+16b+12c-6a+6b+12c=2a+24c+24b
c)-7x+14y+8x-4y-6x+6y= -5x+16y
d) 20x^3+20x^2+4x+8-20x^3+4x^2-4x=24x^2+8
e) 24a-2b-a-2b=23a-4b
f) a+2,5b-05c+0,3c-0,5a+0,2b=0,5a+2,7b-0,2c