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a-c=b
b=a-c
a-b=c
c=a-b
a=bc-d
d=bc-a
bc=a+d
b=(a+d)/c
c=(a+d)/b
a=bc+d
d=a-bc
bc=d-a
b=(d-a)/c
c=(d-a)/b
a=b(c+d)
b=a/(c+d)
c+d=a/b
c=a/b -d
d=a/b -c
a=b+c
b=a-c
c=a-b
a=b-c
c=b-a
b=a+c