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y+4=-5x-15
Use the distributive property to multiply -5 by x+3.
-5x-15=y+4
Swap sides so that all variable terms are on the left hand side.
-5x=y+4+15
Add 15 to both sides.
-5x=y+19
Add 4 and 15 to get 19.
\frac{-5x}{-5}=\frac{y+19}{-5}
Divide both sides by -5.
x=\frac{y+19}{-5}
Dividing by -5 undoes the multiplication by -5.
x=\frac{-y-19}{5}
Divide y+19 by -5.
y+4=-5x-15
Use the distributive property to multiply -5 by x+3.
y=-5x-15-4
Subtract 4 from both sides.
y=-5x-19
Subtract 4 from -15 to get -19.