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Pls help it is 7th grade math

Pls help it is 7th grade math-example-1
User Jatentaki
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39+\frac 15 w \\\\=39+\frac 15 \left(-\frac 12 \right)\\\\\\=39 - \frac 1{10}\\\\\\=(389)/(10)\\\\\\=38(9)/(10)

User Bwing
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