a + b + c = d
d − c − b = a
d − a = b + c
d − a − b = c
a + c = d − b
c + b = d − a
b = d − a − c
d − c = a + b
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a + b + c = d
d − c − b = a
d − a = b + c
d − a − b = c
a + c = d − b
c + b = d − a
b = d − a − c
d − c = a + b