The corrcet answer would be relational.
You don't know about me, without you have read a book by the name of The Adventures of Tom Sawyer, but that ain't no matter.
Answer: Swimming............
Start of by writing 7x+1=50. Subtract 1 from both sides. You will get 50-1=49. Then you have 7x=49. Divide 7 on both sides. 7x/7. 49/7=7. X=7. Therefore x=7. Check your answer by plugging 7 into x. 7(7)=49+1=50. The answer checks out!