Solve for d
d = \frac{20}{9} = 2\frac{2}{9} \approx 2.222222222
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30=10+9d
Subtract 1 from 10 to get 9.
10+9d=30
Swap sides so that all variable terms are on the left hand side.
9d=30-10
Subtract 10 from both sides.
9d=20
Subtract 10 from 30 to get 20.
d=\frac{20}{9}
Divide both sides by 9.
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