Solve for B
B=7-C
Solve for C
C=7-B
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1B+C=7
Anything divided by one gives itself.
1B=7-C
Subtract C from both sides.
B=-C+7
Reorder the terms.
1B+C=7
Anything divided by one gives itself.
C=7-B
Subtract 1B from both sides.
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