Solve for a
a=6-b_{18}
Solve for b_18
b_{18}=6-a
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a+b_{18}=6
Swap sides so that all variable terms are on the left hand side.
a=6-b_{18}
Subtract b_{18} from both sides.
a+b_{18}=6
Swap sides so that all variable terms are on the left hand side.
b_{18}=6-a
Subtract a from both sides.
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