How do i solve 13 + a/11 = 7

a = -66

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

13 + a/11 = 7

Step 2: Solve for a

Subtract 13 on both sides:                     a/11 = -6Multiply 11 on both sides:                       a = -66

Step 3: Check

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

Substitute in a:                     13 - 66/11 = 7Divide:                                   13 - 6 = 7Subtract:                               7 = 7

Here we see that 7 does indeed equal 7.

∴ a = -66 is the solution to the equation.

127 millimeters is the answer