Solve for z
z=0.5
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5z=2.5
Add 0.4 and 2.1 to get 2.5.
z=\frac{2.5}{5}
Divide both sides by 5.
z=\frac{25}{50}
Expand \frac{2.5}{5} by multiplying both numerator and the denominator by 10.
z=\frac{1}{2}
Reduce the fraction \frac{25}{50} to lowest terms by extracting and canceling out 25.
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