Question

x•9=130+140
x•9=270
x=270:9
x=30
30•9=130+140
270=270

Answer 1

Ответ:

$x \times 9 = 130 + 140 \\ 9x = 130 + 140 \\ 9x = 270 \\ x = 30 \\ 30 \times 9 = 130 + 140$