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Using the acronym PEMDAS, meaning parenthases, exponents, multiply/divide, add/subtract
you well learn it in 3 if you are a head but mostly in the 4th grade hope i helped ya out^^ i started in 3rd grade... and u learn it basically the rest of ur years
Because if you did operations in an impermissible order, or violated laws of operations, then your solution to the equation is wrong.
Because if you perform the operations in a different order your answer will be wrong.
The order of operations relate to solving multi-step equations because you are following the order of operations just in a backwards way.