Mathematically, it does not matter. But it can be harder and you do need to know exactly what you are doing.
For example, if you need to solve 5x + 3 = 23
the conventional 2-step method is as follows:
Step 1: 5x + 3 - 3 = 23 - 3
which gives 5x = 20
Step 2: 5x/5 = 20/5
so that x = 4.
But you could also have done
Step 1: 5x/5 + 3/5 = 23/5
which gives x + 3/5 = 23/5
Step 2: x + 3/5 - 3/5 = 23/5 - 3/5
ans so x = 20/5 = 4 as before.
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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.
5-7m+9m=11
In a two step equation, you need to do another step.
You have to follow the order of operations which goes as follows, parentheses, then exponents, then multiplication, then division, then addition, and finally subtraction
Just keep doing the same thing to both sides of the equation at every step.