Пошаговое объяснение:
6х=28-х
6x + x = 28
7x = 28
x = 28 : 7
x = 4
9х-26=30-5х
9x + 5x = 30 + 26
14x = 56
x = 56 : 14
x = 4
7-3х=6х-56
6x + 3x = 56 + 7
9x = 63
x = 63 : 9
x = 7
0,9х-7,4= - 0,4х+4,3
0,9x + 0,4x = 4,3 + 7,4
1,3x = 11,7
x = 11,7 : 1,3
x = 9
5,8-1,6х=0,3х-1,8
0,3x + 1,6x = 5,8 + 1,8
1,9x = 7,6
x = 7,6 : 1,9
x = 4
3/8х+19=7/12х+24
7/12x - 3/8x = 19 - 24
14/24x - 9/24x = -5
5/24x = -5
x = -5 * 24/5
x = -24
5(х-4)=х+8
5x - 20 = x + 8
5x - x = 8 + 20
4x = 28
x = 28 : 4
x = 7
9-7(х+3)=5-6х
9 - 7x - 21 = 5 - 6x
-12 - 7x = 5 - 6x
7x - 6x = -12 - 5
x = -17
(7х+9)- (11х-7)=8
7x + 9 - 11x + 7 = 8
-4x + 16 = 8
4x = 16 - 8
4x = 8
x = 8 : 4
x = 2
3,6+5х=7(1,2-х)
3,6 + 5x = 8,4 - 7x
5x + 7x = 8,4 - 3,6
12x = 4,8
x = 4,8 : 12
x = 0,4
5/6x-1/4x=-6-8 X 7/12x+8x=6 8целая7/12x=6 x=6:8целая7/12 x=нет ответа