Solve for S_5
S_{5}=18
Assign S_5
S_{5}≔18
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S_{5}=5+4+3+6
Add 2 and 3 to get 5.
S_{5}=9+3+6
Add 5 and 4 to get 9.
S_{5}=12+6
Add 9 and 3 to get 12.
S_{5}=18
Add 12 and 6 to get 18.
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