Multi step equations solving

What is the 1st step in solving the following equation?

3x + 7 = x - 21

• Move variables to same side

• Add 7 to both sides

• divide both sides by 3

• Subtract 21 from both sides

What is the 1st step in solving the equation?

2x - 4x = 1 - x

• -2x = 1-x

• -4x = 1 - x + 2x

• 8x = 1 - x

• 2x - 4x = 0

Which step is incorrect?

120 = -4(7a+2)

Step 1: 120 = -28a - 8

Step 2: 112 = -28a

Step 3: a=-4

• Problem is correct

• step 1

• step 2

• step 3

Solve.

7 + 4x + 4x = 8x + 3 + 4

• no solution

• all real numbers

• 7

• 3

Solve

7 + 3x = 14 + 3x

• all real numbers

• no solution

• 5

• 9

Solve the equation:
3(x - 1) = 2x + 9

• x = 12
• no solution
• x = 10
• x = 6

Solve the equation:
3x - x + 2 = 4(2x - 1)

• infinite solutions
• x = 1
• x = -1
• no solution

Solve the equation:
4 - 6x - 2= -2(3x-1)

• no solution
• infinitely many solutions
• x = ⅓
• x = 4

Solve the equation:
2x - 1 = ¾x + 9

• x = -10
• x = 8
• x = -37
• x = 6

Find the solution:
10 = 4x - 2

• x = 3
• x = 2
• x = -3
• x = -2