Solve for b
b=\frac{x-a}{3}
Solve for a
a=x-3b
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3b=x-a
Subtract a from both sides.
\frac{3b}{3}=\frac{x-a}{3}
Divide both sides by 3.
b=\frac{x-a}{3}
Dividing by 3 undoes the multiplication by 3.
a=x-3b
Subtract 3b from both sides.
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