Solve for d
d=3.25
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2d=3.75+2.75
Add 2.75 to both sides.
2d=6.5
Add 3.75 and 2.75 to get 6.5.
d=\frac{6.5}{2}
Divide both sides by 2.
d=\frac{65}{20}
Expand \frac{6.5}{2} by multiplying both numerator and the denominator by 10.
d=\frac{13}{4}
Reduce the fraction \frac{65}{20} to lowest terms by extracting and canceling out 5.
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