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3b+7-1=-3

3x+1-6x=7

312=-6 (7x-3)

-4 (4n-8) = 128

b = - 3

x = - 2

x = - 7

n = - 6

Step-by-step explanation:

3b+7-1=-3

3b = - 3 - 7 + 1

3b = - 10+1

3b = - 9

b = - 9/3

b = - 3

3x+1-6x=7

-3x = 7-1

-3x = 6

x = - 6/3

x = - 2

312=-6 (7x-3)

312 = - 6*7x + 6*3

312 = - 42x + 18

312-18 = - 42x

294 = - 42x

x = - 294/42

x = - 7

-4 (4n-8) = 128

-4*4n + 4*8 = 128

-16n + 32 = 128

-16n = 128-32

-16n = 96

n=-96/16

n = - 6

3b+7-1=-3

3b+6 = - 3

Move + 6 to the other side. Sign changes from + 6 to - 6.

3b+6-6 = - 3-6

3b=-9

Divide by 3

3b/3=-9/3

b = - 3

3x+1-6x=7

3x-6x+1 = 7

-3x+1 = 7

Move + 1 to the other side. Sign changes from + 1 to - 1.

-3x+1-1 = 7-1

-3x=6

Divide by - 3

-3x/3 = 6/-3

x = - 2

312=-6 (7x-3)

Mutiply the bracket by - 6

312 = (-6) (7x) (-6) (-3)

312 = - 42x+18

Move + 18 to the other side.

312-18 = - 42x+18-18

312-18 = - 42x

294 = - 42x

divide by - 42

294/-42 = - 42/-42x

x = - 7

-4 (4n-8) = 128

Mutiply the bracket by - 4

(-4) (4n) (-4) (-8) = 128

-16n+32 = 128

move + 32 to the other side

-16n+32-32 = 128-32

-16n = 96

divide by - 16

-16/-16n = 96/-16

n = - 6

Answers:

b = - 3

x = - 2

x = - 7

n = - 6