An equation that has several letters or variables is a polynomial
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It means to find what numbers the variables (the letters) must be in order to make the equation a true statement.
An equation with two or more variables is called a polynomial. It can also be a literal equation.
You isolate variables in math because the point of an equation is to solve for the variables. By isolating the variables you have learned what that variable stands for and thus solved the equation.
The number and variables when next to each other in an equation are called a term. The variable or letters are coefficients.4x + 3x = 28.4x and 3x are terms and the variable "x" is the coefficient.
It is the set of values for all the variables in the equation which make the equation true.