To simplify the expression \( \frac{3}{10}x + \frac{1}{6}y + \frac{3}{10}x + \frac{3}{6}y \), we can first combine like terms.
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Combine the coefficients of \( x \): \[ \frac{3}{10}x + \frac{3}{10}x = \left( \frac{3}{10} + \frac{3}{10} \right)x = \frac{6}{10}x = \frac{3}{5}x \]
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Combine the coefficients of \( y \): \[ \frac{1}{6}y + \frac{3}{6}y = \left( \frac{1}{6} + \frac{3}{6} \right)y = \frac{4}{6}y = \frac{2}{3}y \]
Now we put together the simplified terms: \[ \frac{3}{5}x + \frac{2}{3}y \]
Thus, the simplified expression is: \[ \frac{3}{5}x + \frac{2}{3}y \]