Solve for T_12
T_{12}=9
Assign T_12
T_{12}≔9
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T_{12}=5+1\times 4
Subtract 1 from 2 to get 1.
T_{12}=5+4
Multiply 1 and 4 to get 4.
T_{12}=9
Add 5 and 4 to get 9.
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