A.a3-(2a-b-c)=a3-2a+b+c | B.3a-5b-1=-(-3a)-(5b+1) |
C.(a+1)-(-b+c)=-(-1+b-a+c) | D.a-b+c-d=a-(b+d-c) |
A.a-b+c=a-(b+c) | B.a+b-c=a-(b-c) |
C.a-b-c=a-(b+c) | D.a-b+c-d=(a+c)-(b-d) |
A.2x+2y=2xy | B.5x+x=5x2 |
C.-3mn+mn=-2mn | D.8a2b-7a2b=1 |
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