Question

What number does x stand for in this equation?

-7x + 6= 27
A
21
B
2
C
-3
D
-7

Answer 1

C. -3

General Formulas and Concepts:

Pre-Algebra

Order of Operations: BPEMDAS

1. Brackets
2. Parenthesis
3. Exponents
4. Multiplication
5. Division
6. Addition
7. Subtraction

• Left to Right

Equality Properties

• Multiplication Property of Equality
• Division Property of Equality
• Addition Property of Equality
• Subtraction Property of Equality

Explanation:

Step 1: Define

-7x + 6 = 27

Step 2: Solve for x

1. [Subtraction Property of Equality] Subtract 6 on both sides: -7x = 21
2. [Division Property of Equality] Divide -7 on both sides: x = -3