Solve for b
b=10-x
Solve for x
x=10-b
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2b=20-2x
Subtract 2x from both sides.
\frac{2b}{2}=\frac{20-2x}{2}
Divide both sides by 2.
b=\frac{20-2x}{2}
Dividing by 2 undoes the multiplication by 2.
b=10-x
Divide 20-2x by 2.
2x=20-2b
Subtract 2b from both sides.
\frac{2x}{2}=\frac{20-2b}{2}
Divide both sides by 2.
x=\frac{20-2b}{2}
Dividing by 2 undoes the multiplication by 2.
x=10-b
Divide 20-2b by 2.
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