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5w-4b=80
Multiply both sides of the equation by 20, the least common multiple of 4,5.
-4b=80-5w
Subtract 5w from both sides.
\frac{-4b}{-4}=\frac{80-5w}{-4}
Divide both sides by -4.
b=\frac{80-5w}{-4}
Dividing by -4 undoes the multiplication by -4.
b=\frac{5w}{4}-20
Divide 80-5w by -4.
5w-4b=80
Multiply both sides of the equation by 20, the least common multiple of 4,5.
5w=80+4b
Add 4b to both sides.
5w=4b+80
The equation is in standard form.
\frac{5w}{5}=\frac{4b+80}{5}
Divide both sides by 5.
w=\frac{4b+80}{5}
Dividing by 5 undoes the multiplication by 5.
w=\frac{4b}{5}+16
Divide 80+4b by 5.