Thank you for the opportunity to help you with your question!

let suppose is x so according to the given condition

3(-4+5*x) = 7*x-212

-12+15*x =7*x -212

15*x-7*x = 212+12

8 *x= 224

x= 224/8

x= 28 so the number is 28

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Please let me know if you need any clarification. I'm always happy to answer your questions.