Three Step Math Problem Linear Equation

Solve for x:
6(2x + 1) = 18

• 3
• 17/12
• 1
• 2

2x + 3(5x - 7) = 47

• 1
• 2
• 3
• 4

8v - 4(v + 8) = 8

• 2
• 10
• 4
• -4 

-11 + 3(b + 5) = 7

• 1
• -1
• 3
• -3

7(1 - y) = -3(y - 2)

• x = 1/4
• x = 4
• x = 5

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

• 4
• 3
• 2
• 1

• 7

• identity

• 0

• -5

• 2

• no solution

• identity

• 5

• 3

• no solution

• identity

• 5

Find the error in the problem below
19 - 2k = 3k - 1
     +3k   +3k
19 + 1k = -1
-19           -19
k = -20

• They should have divided by 1 for the last step
• They should add 19 instead of subtracting 19
• I can not find an error
• Instead of adding 3k they should subtract 3k