Verified answer

(38+b)*12=840

38+b=840:12

38+b=70

b=70-38

b=32

14(p-30)=630

р-30=630:14

р-30=45

р=30+45

р=75

(43-s)*17=289

43-s=289:17

43-s=17

s=43-17

s=26