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What is the value of 1-18+25 if you subtract then add? If you add then subtract? Why is the order of operations necessary?

What is the value of 1-18+25 if you subtract then add? If you add then subtract? Why is the order of operations necessary?
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What is the value of 1-18+25 if you subtract then add? If you add then subtract? Why is the order of operations necessary?

User Furkan Omay
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In this problem it just goes left to right, 1-18+25 = -17+25 = 8
(1-18)+25-17+25=8
When you do addition and subtraction they are reversible so you just go left to right
User Franklin Tarter
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