Solve for y
y=\frac{2}{5}=0.4
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7y+3y=4
Add 3y to both sides.
10y=4
Combine 7y and 3y to get 10y.
y=\frac{4}{10}
Divide both sides by 10.
y=\frac{2}{5}
Reduce the fraction \frac{4}{10} to lowest terms by extracting and canceling out 2.
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