7x-18=4x+12
7x-4x=12+18
3x=30
x=30:3
x=10
7*10-18=4*10+12
70-18=40+12
52=52
ответ:x=10
7x - 18 = 4x + 12
7x - 4 = 18 + 12
3x = 30
x = 30 : 3
x = 10
7x-18=4x+12
7x-4x=12+18
3x=30
x=30:3
x=10
7*10-18=4*10+12
70-18=40+12
52=52
ответ:x=10
7x - 18 = 4x + 12
7x - 4 = 18 + 12
3x = 30
x = 30 : 3
x = 10