Ищу 5*(8x+3)-12=83 7*(2x+9)+3x=114 3*(4x+13)-25=74

5*(8x+3)-12=83           7*(2x+9)+3x=114                 3*(4x+13)-25=74

5*(8Х+3)=83+12           14x+63+3x=114                   12x+39=74+25

5*(8Х+3)=95                 17x=114-63                        12x+39=99

8х+3=95:5                    17x=51                              12x=99-39

8x+3=19                       x=51:17                             12x=60

8x=19-3                       x=3                                     x=60:12

8x=16                          7*(2*3+9)+3*3=114              x=5            

x=16:8                        7*15+9=114                         3*(4*5+13)-25=74

x=2                              114=114                             99-25=74 

5*(8*2+3)-12=83                                                     74=74

83=83