Запишите уравнения
(38+b)*12=840
14*(p-30)=630
(43-s)*17=289

1)(38+b)*12=840456+12b=84012b=840-45612b=384b=384/12b=322)14*(p-30)=63014p-420=63014p=630-42014p=210p=210/14p=153)(43-s)*17=289731-17s=289-17s=289-731-17s= -442-s =-442/17-s=-26s=26