Why don't people's education press solve equations in the fifth grade mathematics?

1, according to the properties of the equation.

Properties of the equation 1: Add or subtract the same number on both sides of the equation, and the left and right sides are still equal.

Property 2 of the equation: the two sides of the equation are multiplied by the same number, or divided by the same number that is not 0, and the left and right sides are still equal.

For example, if X=5 holds, then X+2=5+2 and X-3=5-3 also hold.

If X=5 holds, then X×2=5×2 and X÷2=5÷2 also holds.

2. Method of addition, subtraction, multiplication and division according to the relationship between parts.

I want to know which knowledge points are often mixed with the mathematical series of the college entrance examination. Or which knowledge points are often mixed with the usual series of questions?

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