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3x=15+y
Add y to both sides.
3x=y+15
The equation is in standard form.
\frac{3x}{3}=\frac{y+15}{3}
Divide both sides by 3.
x=\frac{y+15}{3}
Dividing by 3 undoes the multiplication by 3.
x=\frac{y}{3}+5
Divide 15+y by 3.
-y=15-3x
Subtract 3x from both sides.
\frac{-y}{-1}=\frac{15-3x}{-1}
Divide both sides by -1.
y=\frac{15-3x}{-1}
Dividing by -1 undoes the multiplication by -1.
y=3x-15
Divide 15-3x by -1.