Equation

An equation is a mathematical formula containing an equals sign, to show that two expressions are equal.

The word equation and its cognates in other languages may have subtly different meanings;

for example, in French, in Estonian etc an equation is defined as containing one or more variables.

In English, any well-formed formula consisting of two expressions related with an equals sign is an equation.

Examples: 

• 3 + 6 = 9
• x + 6 = 9
• 4x = 12
• x² + 2x – 3 = 0
• 

Solving the simple equation

x + a = bx = b – a

x – a = bx= b + a

a – x = bx = a – b

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Examples:

x + 2 = 8x = 8 – 2 x = 6

x – 2 = 6x= 6 + 2 x = 8

8 – x = 6x = 8 – 6 x = 2

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x *  a = bx = b : a

x : a = bx= b * a

a : x = bx = a : b

Examples:

x * 2 = 8x = 8 : 2 x = 4

x : 2 = 6x= 6 * 2 x = 12

48 : x = 6x = 48 : 6 x = 8