Solve for d
d=4.4
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2d+3.2=12
Swap sides so that all variable terms are on the left hand side.
2d=12-3.2
Subtract 3.2 from both sides.
2d=8.8
Subtract 3.2 from 12 to get 8.8.
d=\frac{8.8}{2}
Divide both sides by 2.
d=\frac{88}{20}
Expand \frac{8.8}{2} by multiplying both numerator and the denominator by 10.
d=\frac{22}{5}
Reduce the fraction \frac{88}{20} to lowest terms by extracting and canceling out 4.
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