An equation is a mathematical equality between two algebraic expressions, called members, in which known and unknown elements (called variables) appear. A solution to an equation is a number that can be substituted for the variable to make it a true number sentence.

**Solving equations **

- If present, remove parentheses and denominators.
- Group the variable terms in one member and the independent terms in the other.
- Reduce like terms.
- Clear the variable.

**Example 1**: Solve the following equation 0.3 + a = 1.6.

To group the terms of the variable "a" into a member, we subtract 0.3 from both sides of the equality:

0.3 + a - 0.3 = 1.6 - 0.3

a = 1.3

**Example 2**: Solve the following equation k - 8 = 11.8

To group the terms of the variable “k” into a member, we add 8 to both sides of the equality:

k - 8 + 8 = 11.8 + 8

k = 19.8

**Example 3**: Solve the following equation n / 5 + 0.6 = 2

As in the previous cases, we owe the variable n. We subtract 0.6 from both sides of equality:

n / 5 + 0.6 - 0.6 = 2 - 0.6

n / 5 = 1.4

Now, we multiply both sides by 5:

(n / 5) · 5 = (1,4) · 5

n = 7