Solve for b
b=\frac{a-5}{2}
Solve for a
a=2b+5
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2b+5=a
Swap sides so that all variable terms are on the left hand side.
2b=a-5
Subtract 5 from both sides.
\frac{2b}{2}=\frac{a-5}{2}
Divide both sides by 2.
b=\frac{a-5}{2}
Dividing by 2 undoes the multiplication by 2.
Examples
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\frac { d } { d x } \frac { ( 3 x ^ { 2 } - 2 ) } { ( x - 5 ) }
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Limits
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