Question

а*4+329=9557   и  5364-d*7=2578

Answer 1

а*4+329=9557

4а=9557-329

4а=9228

а=9228:4

а=2307 

5364-d*7=2578

7d=5364-2578

7d=2786

d=2786:7

d=398 

Answer 2

а*4+329=9557                 5364-d*7=2578

а*4=9557-329                  -d*7=2578-5364

а*4=9228                          -d*7=-2786

а=9228:4                           d=-2786:(-7)

а=2307                              d=398

_______________________        __________________________

2307*4+329=9557            5364-398*7=2578