A mathematical sentence that contains an equals sign would be called an equation.
An equasion
An equation
It is an equation.
a equation
No, there is no need for a capital letter after an equal sign in most cases. The convention is to start a new sentence with a capital letter and not necessarily after an equal sign within a sentence.
Is a number sentence that does not equal anything or has an equal sign.
A mathematical sentence that contains an equals sign would be called an equation.
Equation
An equasion
A mathematical sentence that contains an equal sign is called an equation
This is called an equation.
An equation
It is an equation.
a equation
A number sentence that equals or that has an equal sign.
a number sentence contains an equal sign