Simplify both sides of the equation
15+3w+12+w=3
(3w+w)+(15+12)=3
Combine like terms
4w+27=3
Subtract 27 from both sides
4w+27-27=3-27
4w=-24
Divide both sides by 4
4w/4=-24/4
w=-6
I hope that's help !
