When the equation is deformed, it may sometimes produce roots that are not suitable for the original equation, that is, the denominator value is 0 after substituting into the fractional equation or the root of the transformed whole equation is just the root of the value beyond the allowable value of the unknown quantity of the original equation, which is called increasing the root of the original equation.

Source of root growth:

For fractional order equations, when the denominator is zero, it is meaningless, so unknowns are not allowed to take those values that make the denominator zero, that is, the fractional order equation itself implies the condition that the denominator is not zero. When the fractional equation is transformed into an integral equation, this restriction is lifted. In other words, the range of unknown values in the equation is expanded. If the root of the transformed integral equation is just outside the allowable value of the unknown quantity of the original equation, then the root will increase.

The root is the solution of the equation.

I hope I can help you, hehe