Question

×+5=9. 30+а=70
×=
×=

Answer 1

Ответ:

$x + 5 = 9 \\ x = 9 - 5 \\ x = 4$

$30 + a = 70 \\ a = 70 - 30 \\ a = 40$

Answer 2

x+5=9

x=4

30+a=70

a=40

............... ;)