Solve for a_1
a_{1}=354
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120=a_{1}-234
Multiply 13 and -18 to get -234.
a_{1}-234=120
Swap sides so that all variable terms are on the left hand side.
a_{1}=120+234
Add 234 to both sides.
a_{1}=354
Add 120 and 234 to get 354.
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