Solve for a
a=3-\frac{20}{y}
y\neq 0
Solve for y
y=-\frac{20}{a-3}
a\neq 3
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ay=3y-25+5
Add 5 to both sides.
ay=3y-20
Add -25 and 5 to get -20.
ya=3y-20
The equation is in standard form.
\frac{ya}{y}=\frac{3y-20}{y}
Divide both sides by y.
a=\frac{3y-20}{y}
Dividing by y undoes the multiplication by y.
a=3-\frac{20}{y}
Divide 3y-20 by y.
ay-5-3y=-25
Subtract 3y from both sides.
ay-3y=-25+5
Add 5 to both sides.
ay-3y=-20
Add -25 and 5 to get -20.
\left(a-3\right)y=-20
Combine all terms containing y.
\frac{\left(a-3\right)y}{a-3}=-\frac{20}{a-3}
Divide both sides by a-3.
y=-\frac{20}{a-3}
Dividing by a-3 undoes the multiplication by a-3.
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