Question

cum se rezolva exercitiul 3x(99+d)-100=275

Answer 1

3(99+d)=275+100
297+3d=375
3d=375-297
d=78:3
d=26

Answer 2

3*(99+d)-100=275
3*(99+d)=275+100
3*(99+d)=375
99+d=375:3
99+d=125
d=125-99
d=26
         S={26}