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1. 4x+(-8)=-12
4x=-12+8
x=-1

2.27-[3x-(7x-12)+7]=0
[3x-(7x-12)+7]=27
-4x=8
x=-2

3.2(x-2)=3x
2x-4=3x
x=-4

4.x+2x+(x+1)=49
4x=50
x=12.5

1.
4x + (-8) = -12
(remember the + - are needed to change --->[ + - ]---> -)
4x - 8 = -12
(change position)
4x = -12+8
x = -4/ (divided by)4
x = -1

2.

27 -[ 3x - ( 7x - 12 ) + 7 ] = 0
(change 27 to another side)
[ 3x - ( 7x - 12 ) + 7 ] = 27
3x - 7x = 27 - 7 + 12
-4x = 8
x = 8/ -4
x = -2

3.

2 ( x - 2 ) = 3x
Muiltipe inside
2x - 4 = 3x
-4 = 3x - 2x
x = -4

4.
x + 2x + ( x + 1 ) = 49
x + 2x + x = 49 - 1
4x = 50
x = 50/4
x = 12.5

Hope this can help =]

1. 4x+(-8) = -12
4x = -12-8
x = -20÷4
x = -5

2. 27-[3x-(7x-12)+7] = 0
27-[3x-7x+12+7] = 0
-10x-12-7 = 0-27
-10x = -27+12+7
-10x = -8
x = -8÷-10
x = 0.8

3. 2(x-2) = 3x
2x-4 = 3x
-4 = 3x-2x
-4 = x
x = -4

4. x+2x+(x+1) = 49
3x+x+1 = 49
4x = 49-1
x = 48÷4
x= 24

1) x = 5
2) x = -2
3) x = -4
4) x = 12