Primary school equation

Equation is a process of finding the unknown by using "known conditions", such as one-dimensional linear equation:

x+5= 10

Combine similar terms, put the unknowns on the left and the numbers on the right, (when moving terms to both sides of the equation, you need to change the sign, that is, "positive versus negative" or "negative versus positive") that is:

x= 10-5

You can get the answer by calculation:

x=5

The primary school stage is at most a one-dimensional linear equation or a two-dimensional linear equation, which can be handled by making full use of the principle of merging similar items; As for univariate quadratic equation, bivariate quadratic equation and even multivariate quadratic equation, there will be other formulas and their solutions in the later higher learning stage.