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3x+15=5y
Add 5y to both sides. Anything plus zero gives itself.
3x=5y-15
Subtract 15 from both sides.
\frac{3x}{3}=\frac{5y-15}{3}
Divide both sides by 3.
x=\frac{5y-15}{3}
Dividing by 3 undoes the multiplication by 3.
x=\frac{5y}{3}-5
Divide -15+5y by 3.
-5y+15=-3x
Subtract 3x from both sides. Anything subtracted from zero gives its negation.
-5y=-3x-15
Subtract 15 from both sides.
\frac{-5y}{-5}=\frac{-3x-15}{-5}
Divide both sides by -5.
y=\frac{-3x-15}{-5}
Dividing by -5 undoes the multiplication by -5.
y=\frac{3x}{5}+3
Divide -3x-15 by -5.