for sloving equations ,we should do the reverse of the order of operations right? So it's not PEMDAS, its the other way round?

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Kinda... when solving an equation you are "undo"ing operations.  So in a way, you are going backwards in that you need to undo the constant by adding the opposite, then undo the coefficient by using multiplication or division.  Lastly if your variable is squared (such as when working backwards to find radius or in the Pythagorean Theorem) you would take the square root last.   However, in most cases with parentheses in SOLVING equations, you usually get rid of them by distributing FIRST. Solving Multiple-Step Linear Equations takes 3 steps... 1.) Simplify EACH side of the equation by distributing and combining like terms. 2.) "Move" variables to ONE side of the equation by adding the opposite of the "smaller" variable. 3.) Solve by first "undo"ing the constant ("lonely" number) with + -, THEN undo the coefficient (# with variable) using x or \.