To make the equation hold, just change 16 to 19, and the formula becomes 25-6= 19, as shown in the following figure:

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Extended data:

Basic properties of the equation:

Property 1: Add (or subtract) the same algebraic expression on both sides of the equation, and the equation still holds.

If a=b, then a+c = b+c.

Property 2: When both sides of the equation are multiplied or divided by the same algebraic expression that is not 0, the equation still holds.

If a=b, there is a c = b c or a \c = b \c(c≠0).

Property 3: Equation is transitive.

If a 1 = a2, a2 = a3, a3 = a4, ... an = an, then a 1 = a2 = a3 = a4 =...= an.