Х-290=470+230 x+320=90•8

Question

Х-290=470+230
x+320=90•8

Answer 1

X-290=470+230
x=470+230+290
x=700+290
x=990

x+320=90·8
x=720-320
x=400

Answer 2

1)
x - 290 = 470 + 230
x - 290 = 700
x = 700 + 290
x = 990
проверка:
990 - 290 = 470 + 230
700 = 700

2)
x + 320 = 90 * 8
x + 320 = 720
x = 720 - 320
х = 400
проверка:
400 + 320 = 90 * 8
720 = 720