#3 Wrong output

[tzan1]

I tried to do an operation with the provided button [x] / [x] in visual calculator. The operation i tried was 21/4*5/20 but the last 20 (which was in the denominator field) was dividing 4*5 thus giving 1 and total output 21. In the calculator though it gave 1,3125 which means it divides the whole fraction by 20 and not only the denominator. Maybe the program should add automatic the brackets, in such operations, so that wrong outputs are avoided.