To change the equation into the form of X=, for example, X+2=2+3, to change it into the form of X=, you need to move the +2 in X+2= to the right side of the equal sign and write it as X=2+3-2.

This principle is actually the principle that adding or subtracting a number on both sides of an equation will keep the equation unchanged: X+2=2+3

X+2 （-2）=2+3（-2）

Explanation: X=2+3-2

Another example: 2X+10=X-8+2

Move X to the left first, 2X-X=-8+2-10 (-X in 2X-X is obtained by moving X to the left and changing its sign, -8 in -8+2-10 is the result of removing X, so X can be considered as +X, and -10 is obtained by moving +10 from the left and changing its sign)

Calculate X again = -16