Lesson 3-1 : Combining like terms to solve equations

r - 18 = 27

• -45
• 45
• -9
• 9

Solve the equation: 
x + 7 = 12

• x = 5
• x = 19
• x = -5
• x = 84

• Add 10 to both sides

• Subtract 10 to both sides

• Multiply both sides by 10

• Divide both sides by 10

Solve:
7x = 21

• x = 3
• x = 4

• 33

• 14

• -33

• -14

• 3

• 27

• -27

• -12

• x = 15

• x = 56

• x = -56

• x = -1

Solve the following equation 
8 = m - 12

• 4
• 0.5
• 5.0
• 20

Solve the following equation
1 + a = 15

• 14
• 16
• 12
• - 16

What is the correct step to solve for the variable?
15 = m - 5

• add 15 to both sides
• add 5 to both sides
• subtract 15 from both sides
• subtract 5 from both sides