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Answer:
[tex]\frac{17}{40}[/tex]
Step-by-step explanation:
[tex]\frac{3}{5} +(\frac{-1}{4} )\frac{7}{10}\\=\frac{3}{5} +\frac{-7}{40}\\=\frac{28+(-7)}{40}\\=\frac{17}{40}[/tex]