Solve for D
D=15
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D+65=\frac{3.2}{0.04}
Divide both sides by 0.04.
D+65=\frac{320}{4}
Expand \frac{3.2}{0.04} by multiplying both numerator and the denominator by 100.
D+65=80
Divide 320 by 4 to get 80.
D=80-65
Subtract 65 from both sides.
D=15
Subtract 65 from 80 to get 15.
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