Answer
$\frac{4}{5}$
Work Step by Step
$\frac{7}{10}-\frac{3}{10}+\frac{4}{10}$ $\longrightarrow$ add/subtract numerators
=$\frac{7-3+4}{10}$ $\longrightarrow$ simplify
=$\frac{8}{10}$ $\longrightarrow$ simplify
=$\frac{4}{5}$
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