You need to be careful in how you write such questions as it is important to know if you mean:
x - 12/2 = 18
or
(x-12)/2 = 18
If x - 12/2 = 18 then
x = 18 + 12/2
x = 18 + 6
x = 24
If (x-12)/2 = 18 then
x - 12 = 18 * 2
x - 12 = 36
x = 36 + 12
x = 48
4/7 minus 5/12 = 13/84
11/12 − 1/2 = 5/12
3 1/2
7/12
2 and 1/12 minus 1 and 1/3 = 3/4 or 0.75
1/3 − 1/12 = 1/4
The answer to the problem of 5/8 minus 5/24 is 5/12. In decimal form it is 0.41666.
2 − 1/3 = 12/3
8/12 - 3/12 = 5/12 or five twelfths. Expressed as a decimal, this is equal to 0.416 recurring (that is, 0.416666...)
-12 minus -6 is -6
0
2/3 minus 1/4 is 5/12