20(x+9)=140
solve for x

x = -2

General Formulas and Concepts:

Pre-Algebra

Order of Operations: BPEMDAS

Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to Right

Equality Properties

Multiplication Property of Equality Division Property of Equality Addition Property of Equality Subtract Property of Equality

Step-by-step explanation:

Step 1: Define

20(x + 9) = 140

Step 2: Solve for x

Divide 20 on both sides:                    x + 9 = 7Subtract 9 on both sides:                   x = -2

Step 3: Check

Plug in x into the original equation to verify it's a solution.

Substitute in x:                    20(-2 + 9) = 140(Parenthesis) Add:              20(7) = 140Multiply:                               140 = 140

Here we see that 140 does indeed equal 140.

∴ x = -2 is the solution to the equation.