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Solve for a
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Solve for b
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a+b+c=-1
Subtract 1 from both sides. Anything subtracted from zero gives its negation.
a+c=-1-b
Subtract b from both sides.
a=-1-b-c
Subtract c from both sides.
a+b+c=-1
Subtract 1 from both sides. Anything subtracted from zero gives its negation.
b+c=-1-a
Subtract a from both sides.
b=-1-a-c
Subtract c from both sides.