Question

300-78:x=287
750+10*x=750

Answer 1

1) 300 - 78 : х = 287

Переносим 300 к 287:

78 : х = 300 - 287

78 : х = 13

х = 78 : 13

х = 6

2) 750 + 10 * х = 750

10 * х = 750 - 750

10 * х = 0

х = 0