Solve for a
a=\frac{b-x}{6}
Solve for b
b=x+6a
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6a=b-x
Subtract x from both sides.
\frac{6a}{6}=\frac{b-x}{6}
Divide both sides by 6.
a=\frac{b-x}{6}
Dividing by 6 undoes the multiplication by 6.
b=x+6a
Swap sides so that all variable terms are on the left hand side.
Examples
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Limits
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