Question

Ayudenme porfavor,solo lo que esta en rojo
Es para hoy

Answer 1

12)

12 - (2x - 6) = -5x + (2 - x)
12 - 2x + 6 = -5x + 2 - x
18 - 2x = -6x + 2
-2x + 6x = 2 - 18
4x = -16
x = -16/4
x = -4

13)
5x - [3x - (6 + x)] = 3 
5x - [3x - 6 - x] = 3
5x - [2x - 6] = 3
5x - 2x + 6 = 3
3x = 3 - 6
3x = -3
x = -3/3
x = -1

14)
20 - {4 - [3x + (x - 3)]} = 1
20 - {4 - [3x + x - 3]}= 1
20 - {4 - [4x - 3]} = 1
20 - {4 - 4x + 3} = 1
20 - {7 - 4x} = 1
20 - 7 + 4x = 1
13 + 4x = 1
4x = 1 -13
4x = -12
x = -12/4
x = -3

16)
9x-(5x+1)-{2+8x-(7x-5)}+9x = 0
9x-5x-1-{2+8x-7x+5}+9x = 0
4x-1-{7+x}+9x = 0
4x-1-7-x+9x = 0
12x-8 = 0
12x = 8
x = 8/12
x = 2/3

18)
8(x-3)-4 = 27-3(2x-5)
8x-24-4 = 27-6x+15
8x-28 = 42-6x
8x+6x = 42+28
14x = 70
x = 70/14
x = 5

20)
15-3(x-1) = 2(x+3)+2
15-3x+3 = 2x+6+2
18-3x = 2x+8
18-8 = 2x+3x
10 = 5x
10/5 = x
2 = x
x = 2

22)
5-2(1-2x) = 4(4x-3)+9
5-2+4x = 16x-12+9
3+4x = 16x-3
3+3 = 16x-4x
6 = 12x
6/12 = x
1/2 = x
x = 1/2

24)
2(3x-1)+3(x+3) = 7(2x-1)-6
6x-2+3x+9 = 14x-7-6
9x+7 = 14x-13
7+13 = 14x-9x
20 = 5x
20/5 = x
4 = x
x = 4