Question

30+2х=40
2х=728
5х=625
10х=1000

Answer 1

30+2x=40
2x=40-30
2x=10
x=10:2
x=5

2x=728
x=728:2
x=364
Ответ х=364

5х=625
х=625:5
х=125

10х=1000
х= 1000:10
х=100

Answer 2

$30 + 2x = 40 \\ 2x = 40 - 30 \\ 2x = 10 \\ x = 10 \div 2 \\ x = 5 \\ \\ 2x = 728 \\ x = 728 \div 2 \\ x = 364 \\ \\ 5x = 625 \\ x = 625 \div 5 \\ x = 125 \\ \\ 10x = 1000 \\ x = 1000 \div 10 \\ x = 100$