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3a-3b=20-x
Subtract x from both sides.
3a=20-x+3b
Add 3b to both sides.
3a=20+3b-x
The equation is in standard form.
\frac{3a}{3}=\frac{20+3b-x}{3}
Divide both sides by 3.
a=\frac{20+3b-x}{3}
Dividing by 3 undoes the multiplication by 3.
a=-\frac{x}{3}+b+\frac{20}{3}
Divide 20-x+3b by 3.
3a-3b=20-x
Subtract x from both sides.
-3b=20-x-3a
Subtract 3a from both sides.
-3b=20-3a-x
The equation is in standard form.
\frac{-3b}{-3}=\frac{20-3a-x}{-3}
Divide both sides by -3.
b=\frac{20-3a-x}{-3}
Dividing by -3 undoes the multiplication by -3.
b=\frac{x}{3}+a-\frac{20}{3}
Divide 20-x-3a by -3.