Solve for b
b=3-a
Solve for a
a=3-b
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-b+3=a
Swap sides so that all variable terms are on the left hand side.
-b=a-3
Subtract 3 from both sides.
\frac{-b}{-1}=\frac{a-3}{-1}
Divide both sides by -1.
b=\frac{a-3}{-1}
Dividing by -1 undoes the multiplication by -1.
b=3-a
Divide a-3 by -1.
Examples
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Matrix
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Simultaneous equation
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\frac { d } { d x } \frac { ( 3 x ^ { 2 } - 2 ) } { ( x - 5 ) }
Integration
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Limits
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