## Algebra 1 Tutorial

*Solving an equation in one variable*

#### Intro

In general, a one-variable equation such as ax+b=c can be solved by “undoing” the order of operations (PEMDAS).

The order of operations is: parenthesis, exponents, multiplication, division, addition, subtraction. By doing the order of operations in reverse, we unravel the equation and isolate the variable.

#### Sample Problem

Solve for x:

4x+4=20

#### Solution

Here is the systematic way to solve this equation:

Subtract 4 from both sides.

4x+4=20

-4 -4

___________

4x =16

Divide both sides by 4.

4x=16

/4 /4

x=4

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