Решить уравнения 1: 6×x =28-x 2: 9x26=30×5x 3: 7-3x=6x-56 4: 0,9x-7,4=-0,4x+4,3

1.6*X=28-X
6X+X=28
7X=28
X=28:7
X=4

2.9*26=30*5X
234=150X
X=234:150
X=1.56

3.7-3X=6X-56
6X-3X=-56-7
3X=-63
X=-63:3
X=-21

4. 0.9X-7.4=-0.4X+4.3
0.9X+0.4X=4.3+7.4
1.3X=11.7
X=11.7:1.3
X=9