Please help me for these math exercises.
I) If you take away the same number to the upper and the lower part of 4/5 (4 being the upper and 5 the lower) you obtain the number : 5/4.
What number is it that we took off the first number (4/5).
Clarifying :
4/5 - x/x = 5/4.
What is "x" ?
Please help me out.




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