Molecules and denominators cannot be cross-multiplied, which is different from mathematics. One seventh is an integer number, which can only be multiplied by RMB to get dollars!

I didn't look good last night, add some!

What do you mean by u divided by r? Can you say 1 u divided by 1 r? Definitely not.

1, u/r = 1/7 is not a "solvable equation", but a linguistic expression is transformed into a mathematical expression, and the equation cannot be solved like 1/2 = x/3.

2, itself U/R = 1/7 is wrong, it should be written as 1U/7R = 1/7, r and u are just symbols, just units, in other words, can the US dollar be equal to 1/7 compared with RMB? That's usually just written by us for convenience and simplicity, and now you're involved, hehe.