Solve for a
a = -\frac{2}{3} = -0.6666666666666666
Solve for b
b = \frac{2}{3} = 0.6666666666666666
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21a=21b-14
Swap sides so that all variable terms are on the left hand side.
\frac{21a}{21}=\frac{21b-14}{21}
Divide both sides by 21.
a=\frac{21b-14}{21}
Dividing by 21 undoes the multiplication by 21.
a=b-\frac{2}{3}
Divide 21b-14 by 21.
21b=21a+14
Add 14 to both sides.
\frac{21b}{21}=\frac{21a+14}{21}
Divide both sides by 21.
b=\frac{21a+14}{21}
Dividing by 21 undoes the multiplication by 21.
b=a+\frac{2}{3}
Divide 21a+14 by 21.
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