(-y+5•3)+7.2y-9)=6.2y+n
(-y+5x3)+(7.2y-9)=6.2y+n(-y+15)+(7.2y-9)=6.2y+nsince you're adding the two parentheses, you don't need to have them there-y+15+7.2y-9=6.2y+n7.2y-y +15-9 =6.2y+n6.2y + 6 =6.2y+n6.2y - 6.2y -n = -6-n=-6n=6