Grace gives her sister a riddle: i have number x. i add 15 to twice x to get result a. i subtract 4 from x to get result b. i multiply result b by 3 to get result c. result a is equal to result c. grace's sister said the riddle cannot be solved, but grace thought otherwise. who is right? explain

Let's follow step by step.

15 + 2x = A

x - 4 = B

3b = C

A=C

I'm not sure who is right, but I hope this clears up the air

<3

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