Solve for a_7
a_{7}=546-b_{1221}
Solve for b_1221
b_{1221}=546-a_{7}
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a_{7}+b_{1221}=546
Swap sides so that all variable terms are on the left hand side.
a_{7}=546-b_{1221}
Subtract b_{1221} from both sides.
a_{7}+b_{1221}=546
Swap sides so that all variable terms are on the left hand side.
b_{1221}=546-a_{7}
Subtract a_{7} from both sides.
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