Hi. One way to do this is to repeat the line that has a number above it with the number in the expression, instead of trying to show the meaning by actually putting the number above the expression. This number is showing the result of the operation discussed in the text.
2 + (3 x 2) = 3 + 5
2 + (6) = 3 + 5
[braille]#2+(3`*2) .k #3+5
[braille] #2+(6) .k #3+5
X = 3 Y = 4
X + Y = Z
3 + 4 = 7
[braille],X+,y .k ,z
[braille]#3+4 .k #7