12х - 18 + 8 - 6х = 5
6х = 15
х = 2,5
1) 5(x-3)=-2(x-4)+6
5*x-5*3=-2*x-2*(-4)+6
5x-15=-2x+8+6
5x+2x=8+6+15
7x=29
x=29:7
x=4 1/7
2) 1+7(х-2)=5(3-2х)+31 + 7х - 14 = 15 - 10х + 3
7х + 10х = 15 + 3 - 1 + 14
17х = 31
х = 31 : 17
х = 1 14/17
3) 9-6(7-5х)=8+2(х+4)
9-6*7+6*5х=8+2*х+2*4
9-42+30х=8+2х+8
30х-2х=8+8+42-9
28х=48
х=1,75
4) 9/10x=-5 ; x≠0
9= -50x
-50x =9
x = -9/50, x≠0
x=-9/50
x= - 0.18
5)-3/7х = -27/49
х = -27/49 : (-3/7)
х = -27/49 * (-7/3)
х = 9/7
х = 1 2/7
6) 9x-6(-2+x)=-7•5x+20
9x+12-6x=-35x+20
3x+12=-35x+20
3x+35x=20-12
38x=8
x=4/19
7) -3(6x+2)-1=4(x-3)-9
-18x-6-1=4x-12-9
-18x-7=4x-21
-18x-4x=-21+7
-22x=-14
x= 7/11
8) -2/3x=-5/30, x≠0
-2/3x=-1/6
-12=-3x
-3x=-12
x=4
9) -5(-5+3x)-1=9x+5•6
25-15x-1=9x+30
24-15x=9x+30
-15x-9x=30-24
-24x=6
x=-1/4
x= -0.25
x=2,5
Пошаговое объяснение:
12x-18+8-6x=5
6x=5+18-8
6x=15
x=2,5