20 •a - 432 = 568x + 579 = 309.3x - 465 = 76.5​

Question

20 •a - 432 = 568x + 579 = 309.3x - 465 = 76.5​

Answer 1

1) 20а=568+432

20а=1000|÷20

а= 50

2) х=309.3-579=-269.7

3) х= 76.5+465=541.5