Linear equation in one variable

1. Application

1.1. Fraction

1.2. Money

1.3. Geometry

1.4. Age

2. Meanings

2.1. More than, exceeds, older than - (+)

2.2. Less than, decreased, younger- (-)

2.3. Times,of,product- (×)

2.4. Per, for, quotient, divided by- (÷)

3. Value of variable should satisfy equation

4. Rules for solving

4.1. Variable on one side

4.1.1. Can multiply/divide/add/subtract both sides