Solve for a
a=\frac{25-b}{2}
Solve for b
b=25-2a
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a+b+a=25
Add a to both sides.
2a+b=25
Combine a and a to get 2a.
2a=25-b
Subtract b from both sides.
\frac{2a}{2}=\frac{25-b}{2}
Divide both sides by 2.
a=\frac{25-b}{2}
Dividing by 2 undoes the multiplication by 2.
b=25-a-a
Subtract a from both sides.
b=25-2a
Combine -a and -a to get -2a.
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