Evaluate
18
Factor
2\times 3^{2}
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130-\left(18-13+39\right)-68
Add 87 and 43 to get 130.
130-\left(5+39\right)-68
Subtract 13 from 18 to get 5.
130-44-68
Add 5 and 39 to get 44.
86-68
Subtract 44 from 130 to get 86.
18
Subtract 68 from 86 to get 18.
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