1) 9b + 6b = 615+15 15b=630 b=630/15 b=42 2) 2a+123a=472-97 125a= 375 a=375/125 a= 3 3) 17x-x+5x=170+19 21x=189 x= 189/21 x=9 4) 73y-y-22y=190-40 50y=150 y = 150 /50 y = 3