Solve for a
a = \frac{15}{2} = 7\frac{1}{2} = 7.5
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16=2a+1
Subtract 4 from 20 to get 16.
2a+1=16
Swap sides so that all variable terms are on the left hand side.
2a=16-1
Subtract 1 from both sides.
2a=15
Subtract 1 from 16 to get 15.
a=\frac{15}{2}
Divide both sides by 2.
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Limits
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