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3a-2b=4\times 5
Multiply both sides by 5.
3a-2b=20
Multiply 4 and 5 to get 20.
3a=20+2b
Add 2b to both sides.
3a=2b+20
The equation is in standard form.
\frac{3a}{3}=\frac{2b+20}{3}
Divide both sides by 3.
a=\frac{2b+20}{3}
Dividing by 3 undoes the multiplication by 3.
3a-2b=4\times 5
Multiply both sides by 5.
3a-2b=20
Multiply 4 and 5 to get 20.
-2b=20-3a
Subtract 3a from both sides.
\frac{-2b}{-2}=\frac{20-3a}{-2}
Divide both sides by -2.
b=\frac{20-3a}{-2}
Dividing by -2 undoes the multiplication by -2.
b=\frac{3a}{2}-10
Divide 20-3a by -2.