Verified Answer :

x - 17 = 23

23 + 17 = 40

x = 40

To solve this we will use d INVERSE OPERATION of subtraction which is addition. Then we will check our work:-

x - 17 = 23
x = ?
17 + 23 = 40
x = 40

CHECK OUR WORK:-

x - 17 = 23
x = 40
40 - 17 = 23
We were RIGHT!!!

So, x = 40!

Hope I helped ya!!

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