Solve for a
a=-\left(c+b-2s\right)
Solve for b
b=-\left(c+a-2s\right)
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a+c=2s-b
Subtract b from both sides.
a=2s-b-c
Subtract c from both sides.
b+c=2s-a
Subtract a from both sides.
b=2s-a-c
Subtract c from both sides.
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