1) 3(2x-9) = 276x - 27 = 276x = 27 + 276x = 54x = 54/6x = 9
2) 2(2x + 3x) = 204x + 6x = 2010x = 20x = 20/10x = 2
3) 7(3x - x) = 427(2x) = 4214x = 42x = 42/14x = 3
4) 12(x 9x) = 120012(10x) = 1200120x = 1200x = 1200/120x = 10
Ответ: x = 9, x = 2, x = 3, x = 10
1) 3(2x-9) = 27
6x - 27 = 27
6x = 27 + 27
6x = 54
x = 54/6
x = 9
2) 2(2x + 3x) = 20
4x + 6x = 20
10x = 20
x = 20/10
x = 2
3) 7(3x - x) = 42
7(2x) = 42
14x = 42
x = 42/14
x = 3
4) 12(x 9x) = 1200
12(10x) = 1200
120x = 1200
x = 1200/120
x = 10
Ответ: x = 9, x = 2, x = 3, x = 10