Subtraction. Remeber it's PEMDAS. Parenthesis, Exponent, Multiplication, Division, Addition and Subtraction.
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The order of operations relate to solving multi-step equations because you are following the order of operations just in a backwards way.
The last two operations in P.E.M.D.A.S are 'addition' and 'subtraction'.
It means: First, Outers, Inners, Last and is the order of operations when multiplying out bracket in algebra
F = First O = Outside I = Inside L = Last It's for the Order of Operations
Because if you did operations in an impermissible order, or violated laws of operations, then your solution to the equation is wrong.