Solve for y
y=0.07
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3y=0.21
Combine 4y and -y to get 3y.
y=\frac{0.21}{3}
Divide both sides by 3.
y=\frac{21}{300}
Expand \frac{0.21}{3} by multiplying both numerator and the denominator by 100.
y=\frac{7}{100}
Reduce the fraction \frac{21}{300} to lowest terms by extracting and canceling out 3.
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