(x+15=3y)
Solve for y
y=\frac{x+15}{3}
Solve for x
x=3\left(y-5\right)
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3y=x+15
Swap sides so that all variable terms are on the left hand side.
\frac{3y}{3}=\frac{x+15}{3}
Divide both sides by 3.
y=\frac{x+15}{3}
Dividing by 3 undoes the multiplication by 3.
y=\frac{x}{3}+5
Divide x+15 by 3.
x=3y-15
Subtract 15 from both sides.
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