Question

(3400-600)÷Х=400 даю 10 ​

Answer 1

$( 3400 - 600 ) : x = 400 \\ 2800 : x = 400 \\ x = 2800 : 400 \\ x = 7 \\ \big OTBET: x = 7$

Answer 2

2800÷х=400

2800/х=400

домножим обе части на х

2800=400х

х=7